Your score is not terrible! I got interviews the first time round when I took my first DAT and got similar scores. Have you tried using DAT Bootcamp? They have great (realistic) online practice exams for reading, biology, and gen chem.
I think the people that do well on reading usually have strong writing skills and can read analytically. If they are able to decipher scientific literature (like, you're a chem/bio major and have to read published articles for class or research), the better off they are. There are some strategies for the reading section. The main part being that you do not actually have to fully understand or read the article to answer the question. One technique is "search and destroy" where you can read the questions and quickly scan the passage for similar phrases and find the answer (answers are usually verbatim). I do a combination where I lightly read 3/4 of the passage quickly to get the general idea, then I move on to questions and scan quickly through the passage again to remember where the answer should be (the highlight option on the test is very helpful in marking down spots where you THINK will be important for answer questions). Practicing (speed, comprehension, understanding research techniques, etc.) by reading research articles also helps a great deal. There's a bunch of tactics to the reading section! Please message me on this if you need further advice, there's a lot to say.
As for Bio, CliffsNotes was really golden for me (along with DAT Bootcamp for practice). It really helps if you've taken physiology as well (it's where the body systems/hormones/etc. come up).
For Orgo, I revised using Chads videos/coursesaver.org. I was completely and utterly terrible at understanding orgo in class, but the sooner you realize the DAT doesn't ask about mechanisms and only asks pretty straightforward questions, then you'll be less stressed about studying for it. I printed out an outline for orgo (from the coursesaver website) and just remembered all the reactions, you can group up the reactions as well to better memorize them.