oat prep

I have worked with thousands of DAT and OAT students through the years, and one question I get asked over and over is: What study schedule should I follow? One of the biggest mistakes I see students make is trying to follow a study schedule created by someone else. No one else knows your...

I have worked with thousands of DAT and OAT students through the years, and one question I get asked over and over is: What study schedule should I follow? One of the biggest mistakes I see students make is trying to follow a study schedule created by someone else. No one else knows your...

A compound with the molecular formula C8H10 is oxidized to benzoic acid using hot acidic dichromate. Which compound must it be? Work through the molecular formula and oxidation chemistry before checking the second image for Dr. Romano’s explanation. Free DAT and OAT study resources from Dr...

A compound with the molecular formula C8H10 is oxidized to benzoic acid using hot acidic dichromate. Which compound must it be? Work through the molecular formula and oxidation chemistry before checking the second image for Dr. Romano’s explanation. Free DAT and OAT study resources from Dr...

For a limited time, save 15% on all individual DAT and OAT study books from Dr. Jim Romano and the Destroyer team. Use code AUGUST15 at checkout on orgoman.com. Sale ends August 23. Individual books only. Bundles are excluded from this promotion because bundles are automatically discounted...

Can you solve this one? Check the second image for Dr. Romano’s solution. Free DAT and OAT study resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano

DAT and OAT General Chemistry | DAT Destroyer | OAT Destroyer | Dr. Jim Romano Can you solve this one? Check the second image for Dr. Romano’s solution. Free DAT and OAT study resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano...

Review mean, median, mode, variance, and standard deviation for the DAT and OAT Quantitative Reasoning sections. This video works through basic statistics concepts and calculations that DAT and OAT students should understand for test day. Keep practicing and keep Destroying! Free DAT & OAT...

Review mean, median, mode, variance, and standard deviation for the DAT and OAT Quantitative Reasoning sections. This video works through basic statistics concepts and calculations that DAT and OAT students should understand for test day. Free DAT & OAT preparation resources from Dr. Jim...

Birds and dinosaurs provide an interesting way to review evolutionary history for the DAT and OAT. Test yourself with the question in the first image before checking Dr. Jim Romano's explanation in the second image. Keep practicing and keep Destroying! Free DAT & OAT Resources from Dr. Jim...

Birds and dinosaurs provide an interesting way to review evolutionary history for the DAT and OAT. Test yourself with the question in the first image before checking Dr. Jim Romano's explanation in the second image. Keep practicing and keep Destroying! Free DAT & OAT Resources from Dr. Jim...

DAT & OAT Biology Challenge! Iron transport, storage, and utilization are important concepts to understand for the DAT and OAT. Keep practicing and keep Destroying! Dr. Jim Romano DAT Destroyer | OAT Destroyer Test yourself before checking Dr. Romano’s answer and explanation on the...

DAT & OAT Biology Challenge! Iron transport, storage, and utilization are important concepts to understand for the DAT and OAT. Keep practicing and keep Destroying! Dr. Jim Romano DAT Destroyer | OAT Destroyer Test yourself before checking Dr. Romano’s answer and explanation on the second...

Our Fall 2026 Live Online DAT & OAT Prep Course begins September 13, 2026. Prof. Denis Barengolts teaches the live online course, with Dr. Jim Romano joining each class for the first 30–60 minutes for high-yield instruction, guidance, and strategy. Course Dates: September 13 – December 6, 2026...

Fall 2026 Live Online DAT & OAT Prep Course | DAT Destroyer | OAT Destroyer | Dr. Jim Romano Our Fall 2026 Live Online DAT & OAT Prep Course begins September 13, 2026. Prof. Denis Barengolts teaches the live online course, with Dr. Jim Romano joining each class for the first 30–60 minutes for...

onsider Hope, a tortoiseshell cat and a great example of genetics in action. Tortoiseshell coat coloration provides an interesting way to review X-chromosome genetics, mosaicism, and chimerism—concepts worth understanding for DAT and OAT Biology. Free DAT & OAT Resources from Dr. Jim Romano...

Consider Hope, a tortoiseshell cat and a great example of an important genetics concept. Most normal tortoiseshell cats are genetic mosaics caused by random X-chromosome inactivation, not true chimeras. While chimeras involve two separate fused embryos with two distinct DNA sets, standard...

Quick DAT/OAT Biology question from Dr. Jim Romano. Which gene encodes the repressor protein of the lac operon? Understanding gene regulation and the lac operon is important for DAT and OAT Biology. Make sure you understand why the answer is correct rather than simply memorizing it. Free...

Test your knowledge of the lac operon with this DAT/OAT Biology question from Dr. Jim Romano. Which gene encodes the repressor protein of the lac operon? Understanding how the lac operon regulates gene expression—including the roles of the regulatory gene, repressor, and operator—is an...

Endocrine cells are not limited to the major endocrine glands. The stomach also contains enteroendocrine cells that secrete hormones involved in regulating digestion and other physiological processes. Give the problem a try before checking Dr. Romano’s explanation. Understanding the endocrine...

Endocrine cells are not limited to the major endocrine glands. The stomach also contains enteroendocrine cells that secrete hormones involved in regulating digestion and other physiological processes. Give the problem a try before checking Dr. Romano’s explanation. Understanding the endocrine...

Congratulations to one of our Summer 2026 DAT students on an outstanding DAT performance! 🎉 Academic Average: 520 DAT Scores: General Chemistry: 550 Quantitative Reasoning: 530 Reading Comprehension: 530 Survey of Natural Sciences: 510 Organic Chemistry: 490 Biology: 480 Perceptual...

Try the problem first, then check the second image for the complete solution. Free DAT & OAT Resources from Dr. Jim Romano: Start Your DAT and OAT Preparation for Free | Official Resources from Dr. Jim Romano DAT Destroyer & OAT Destroyer: DAT Destroyer & OAT Destroyer | Dr. Jim Romano |...

Can you solve this DAT/OAT Quantitative Reasoning problem? This problem combines complex numbers, radicals, and function evaluation. Pay close attention to what is inside the square root before substituting your value for x. Try the problem first, then check the second image for the...

Periodic table trends are an important General Chemistry concept for both the DAT and OAT. Ionization energy, electronegativity, atomic radius, electron affinity, and metallic character follow important general trends across the periodic table, with some exceptions. Take a look at the chart...

Periodic table trends are an important General Chemistry concept for both the DAT and OAT. Ionization energy, electronegativity, atomic radius, electron affinity, and metallic character follow important general trends across the periodic table, with some exceptions. Take a look at the chart...

Give the problem a try before looking at the solution. Can you solve this DAT/OAT Quantitative Reasoning problem? This permutation problem tests an important counting strategy: arranging objects when certain objects cannot be next to each other. We have three 5-carbon sugars (pentoses)...

Can you solve this DAT/OAT Quantitative Reasoning problem? This permutation problem tests an important counting strategy: arranging objects when certain objects cannot be next to each other. We have three 5-carbon sugars (pentoses) and five 6-carbon sugars (hexoses). How many different...

Can you solve this DAT/OAT Biology problem? The loop of Henle is an important part of kidney physiology. Understanding how the descending and ascending limbs differ in their permeability to water and ions is an important concept for the DAT and OAT. Take a look at the nephron diagram and...

Can you solve this DAT/OAT Biology problem? The loop of Henle is an important part of kidney physiology. Understanding how the descending and ascending limbs differ in their permeability to water and ions is an important concept for the DAT and OAT. Take a look at the nephron diagram and...

Which biome is dominated by gymnosperms such as pines and spruce? Take a look at today’s DAT/OAT Biology problem and give it a try before checking Dr. Jim Romano’s explanation. More free DAT & OAT study resources from Dr. Jim Romano: Free DAT & OAT Resources Join the DAT and OAT Destroyer...

Which biome is dominated by gymnosperms such as pines and spruce? Take a look at today’s DAT/OAT Biology problem and give it a try before checking Dr. Jim Romano’s explanation. More free DAT & OAT study resources from Dr. Jim Romano: Free DAT & OAT Resources Join the DAT and OAT Destroyer...

Which nervous system structure is associated with the control of hunger? The hypothalamus acts as a major control center for hunger and energy balance. It processes hormonal and nutrient signals from the body that help regulate sensations of hunger and fullness. Give this DAT/OAT Biology...

Which nervous system structure is associated with the control of hunger? Give this DAT/OAT Biology question a try before checking Dr. Jim Romano’s solution. The hypothalamus acts as a major control center for hunger and energy balance. It processes hormonal and nutrient signals from the body...

Fibroblasts are a classic DAT and OAT Biology topic that every student should master. They are the primary connective tissue cells responsible for synthesizing collagen and the extracellular matrix, making them essential for tissue repair and maintenance. In the attached slides, Dr. Jim Romano...

Fibroblasts are a classic DAT and OAT Biology topic that every student should master. They are the primary connective tissue cells responsible for synthesizing collagen and the extracellular matrix, making them essential for tissue repair and maintenance. In the attached slides, Dr. Jim Romano...

Can you identify the statement that is NOT a likely explanation for matriarchal leadership in sheep? This DAT/OAT Biology question examines animal behavior, herd dynamics, and evolutionary adaptations. Work through the choices before viewing the answer and explanation on the second slide...

Can you identify the statement that is NOT a likely explanation for matriarchal leadership in sheep? This DAT/OAT Biology question examines animal behavior, herd dynamics, and evolutionary adaptations. Work through the choices before viewing the answer and explanation on the second slide...

Can you solve this DAT/OAT quantitative reasoning problem before looking at the answer? This problem tests your ability to apply percentages, taxes, and algebra to a practical real-world situation. Work through the problem first, then check your solution on the second slide. Free DAT & OAT...

Can you solve this DAT/OAT quantitative reasoning problem before looking at the answer? This problem tests your ability to apply percentages, taxes, and algebra to a practical real-world situation. Work through the problem first, then check your solution on the second slide. Free DAT & OAT...