OAT Biology content

Hi! I am writing my OAT in 3 weeks and am knee deep into my studying and am finding the biology content a bit dense. I am using the Kaplan book which contains a lot of body systems/ anatomy/physiology chapters but many of the practice tests and quizzes online focus more on the plant/animal/genetic/evolutionary biology etc? I am wondering if it is worthwhile to exert tons of time into the anatomy side of things?
I just came out of a year long anatomy/physiology course so I may be ok with the...

OAT Biology content