Mr. Rostov invested a sum of money into an index fund that pays 9% interest per year. After 30 years, his gain was $1,326,767.85. Prior to the investment, Mr. Rostov was saving $50 per day from his salary. How long did he have to save to invest the needed amount to obtain those gains?
A) 2.5...
Paul has been studying for his exams. For every 3 hours he spends studying Biology, he spends 2 hours studying Chemistry.
He did not go to class and spent the entire day in the library. He only got 4 hours of sleep.
The next day, he planned to spend the same total amount of time studying...
This short video breaks down a DAT Gas Law challenge problem that looks easy on the surface but catches many students off guard on test day.
Dr. Jim Romano walks through the setup, strategy, and common mistakes students make with gas law questions under time pressure.
Watch here:
Gas law...
Let us consider the molecule shown above. After OH⁻ attacks in step 1, how many additional mechanism arrows are required to justify the formation of the product?
a) 2
b) 3
c) 4
d) 5
e) 6
f) 7
g) 8
Answer: B
Dr. Romano noted that this transformation is another classic “arrow problem,”...
Organic Chemistry Mechanism Arrows Explained (Video) | DAT Destroyer | OAT Destroyer
Over the years I’ve seen a lot of students struggle with mechanism arrows in Organic Chemistry. It’s one of those areas where once you understand why electrons move, everything else starts to make sense —...
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We are running a free 2025 Math Destroyer Giveaway for a limited time.
⚡ 48-Hour Flash Giveaway — 2025 Math Destroyer
We are running a free 2025 Math Destroyer Giveaway for a limited time.
This giveaway is hosted on our official Reddit community so students can enter and see transparent, public...
We are pleased to announce the winner of our recent DAT Destroyer Giveaway.
Congratulations to our Instagram winner, @seohyunmiin.
Thank you to everyone who participated and continues to support our mission of helping students succeed on the DAT. We will be offering more student giveaways...
.
The sum of Ted’s 4 test scores is 340. How much higher must he score on the final exam, compared to the average of the first four exams, if the final exam is worth one third of the final grade for his average to become 87?
A) 10
B) 7
C) 9
D) 6
E) 4
Answer: D
If the sum of the four test...
Question:
How many distinct C-13 NMR signals does C₆₀ (buckminsterfullerene) produce?
Answer:
Even though C₆₀ contains 60 carbon atoms, it produces only 1 C-13 NMR signal.
This is because the molecule is extraordinarily symmetrical — every carbon atom occupies an identical environment. In NMR...
SN1 vs SN2 is one of the most tested reaction mechanisms on both the DAT and OAT, and many students still struggle to decide which pathway a substitution reaction will follow.
Dr. Romano breaks down the key concepts step-by-step in this short teaching video.
What this video covers:
• The...
Black Friday Giveaway Winner Announcement | DAT Destroyer | OAT Destroyer
Congratulations to our Black Friday Giveaway Winner, @seohyunmiin.
You have won a brand-new DAT Destroyer book from Dr. Jim Romano and Orgoman. Please contact us within 7 days so we can confirm your shipping...
Sheldon has 60 fewer apps on his phone than Patricia.Patricia has 5× as many apps as Sheldon.If their total number of apps were divided evenly among three friends,
how many apps would each friend receive?
A) 12
B) 15
C) 30
D) 20
E) 10
Answer: C
Let S = Sheldon and P = Patricia
S = P – 60...
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Here is a high-yield DAT Math (QR) probability question — a topic many students struggle with on test day. This walkthrough is taught by Prof. Blois and is representative of the style and reasoning you will face on the actual exam.
📌 Watch the video:
Probability questions are extremely...
DAT and OAT Math Practice Question (From Our Math Instructor)
Max and Dave received a combined test score of 140. Max’s score was Z times higher than Dave’s.
How much did Dave score in terms of Z?
A) 140/(Z+1)
B) 140/(Z−1)
C) Z/(140+1)
D) 1/(140+Z)
E) Z/(1−140)
Solution
Let:
M = Max’s...
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DAT Question of the Day
Which of the following does not describe a globular protein?
a. generally function in structure and support roles
b. hemoglobin is an example
c. often function as enzymes or transport proteins
d. peptide chains folded into spherical shapes
e. water soluble
Correct...
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Percent yield shows up frequently on the DAT and OAT, and Dr. Romano breaks it down in a clear, high-yield way you can use on test day.
If you’re prepping for the DAT or OAT, this is a must-know General Chemistry topic.
🎥 Watch the video:
JOIN THE DAT DESTROYER COMMUNITY
👉 Facebook Study...
🎥 Biology video from Dr. Jim Romano:
In this lesson, Dr. Romano explains the difference between decomposers and detritivores — two essential ecological groups that recycle nutrients and maintain balance in ecosystems.
This is a high-yield topic that often appears on the DAT and OAT Biology...
I just took the OAT and I’m pretty happy with my scores. I’ll do my best to share my OAT experience.
I was initially going to take the OAT earlier this year but had to postpone it because of a busy school schedule. I’m not a genius (3.42 GPA as a Bio major) but I do like to think I work very...
How is the physics section? Is it optics heavy? Do we really need to know all of the equations, or are the basic ones most important. I think chad's videos are very mcat oriented. Is all of that covered on the exam? Are destroyers a more accurate representation of the OAT?
Sorry for all the...
Hey all! I am selling all of the material I used to do well on the OAT last summer. I have the following available:
- Huge Kaplan Review Notes book- (light highlighting in first few bio chapters & some erased writing)
- Kaplan Lesson Book- (minimal erased writing)
- Kaplan Flashcards- (all...
I am selling all of the materials I used to study for the OAT. All of these things together helped me to get a competitive score and get into one of the top optometry schools! The following is for sale:
Huge Kaplan Review Notes book- (light highlighting in first few bio chapters & some erased...
FOR SALE!
OAT Big Blue Kaplan Review Notes Book 2016 (VERY helpful, covers all major topics in depth!!)
OAT Destroyer (Organic Chemistry, General Chemistry, Quantitative Reasoning, Biology, Physics) which includes hundreds of practice questions with detailed solutions (VERY SIMILAR TO OAT)
OAT...
I have seen a lot of old info circulating these 2 and was wondering if the Achiever on its own will be enough for practice problems?
I've heard the Achiever was much harder than the Destroyer and that the Destroyer better prepares you for more realistic questions that would appear on the exam...
Selling OAT Destroyer and math combo 2016 (not written in)- original 199.99 plus shipping selling- 150
Kaplan OAT package that includes the Review Notes, Lesson Book, Flash Cards, and Whiteboard and marker - $110
(review notes has very little writing and some highlighting.)
Kaplan OAT 5th...
My test is this Monday. With the limited time I have left, would you guys suggest purchasing OAT Achiever to stimulate more test-like environment or should I continue studying from the OAT destroyer (2nd time over)/Chad's/Kaplan. I did take 2 of the Kaplan tests that came with the book and my...
I took my OAT this week and am now selling all my books/materials. The following is for sale:
Huge Kaplan Review Notes book- (light highlighting in first few bio chapters & some erased writing)
Kaplan Lesson Book- (minimal erased writing)
Kaplan Flashcards
Kaplan OAT Quicksheets
Kaplan OAT Book...
Hi guys, I was thinking about buying the OAT Destroyer book but it is a little pricey ~200 on eBay. I don't know if it's worth it or not. Did anyone use the recent ones and what were your thoughts on it?
Hey Everyone,
I am writing my OAT in July and I want to be really prepared for this test. It's basically do or die for me. I was hoping if anyone has the OAT destroyer books and they are willing to sell it I would really appreciate it. I was on the OAT destroyer website and was gonna buy the...
Hello! I am selling my OAT Destroyer Physics book (2014 Version)
The book is in a brand new condition and has never been used before. I am in New York --I can either meet up or ship it to you.
Price: $55 (shipping isn't included)
Hi everyone,
I am selling the following OAT prep materials:
Kaplan 2016 big blue book (bio, gen chem, orgo, physics, math, reading)
Kaplan 2016 lesson book
OAT destroyer 2016 (bio, gen chem, orgo, reading,) + 2016 physics destroyer
LOTS of flashcards (both Kaplan and my own)
All in good...
Hello everyone! So I recently just took my OAT and my scores are as follows:
Quantitative Reasoning - 340
Reading Comp. - 340
Bio - 370
Gen. Chem. - 400
Orgo - 380...
SELLING OAT BOOKS! Great resources that helped me score 97th percentile :)
ALL IN LIKE-NEW condition! any markings (very very few) are in light pencil that can easily be erased
Kaplan 2016 big blue book-includes all info of all sections along with practice questions
OAT DESTROYER book: must...
Hi! I plan on taking the OAT at the end of august and was wondering if anyone was selling 2016 Kaplan material and possibly still have access that i can purchase from them.
Selling OAT Destroyer books
1) OAT Destroyer (Organic, gen chem, biology and quantitative reasoning) 2014 version
2) Math destroyer 2015 version
3) Physics Destroyer 2014 version
No marks on the inside.
$150 for everything.
email at [email protected]
Hello. I'm planning to study for OAT for 2~3 months(minimum 7 hours everyday). I've already took all the prerequisites and I did fine on all those classes. I'm debating whether I should register for the Kaplan course or do the coursesaver.com (along with all other sources). If I choose to...