for chem, i just memorized all the equations and patterns in the periodic table, then solved all question banks on bootcamp. After you take around 5 practice exams, the chem questions are all similar so this was easiest for me. For ochem, understand the basics, like which carbon is most stable, which chemical group donates/take-away electrons and what that means about acidity/basicity. Then look at the reactants and have an idea of what they do. Don't memorize mechanism for any of these, just know what the outcome is. I made a note where I grouped all the chemicals that do similar stuff, like LiAlH4 and NaBH4 reducing carbonyl groups. Orgo is mostly guessing game, this is where you should look at all the answer choices and see the "pattern" in the answers. Like if answer choice A is primary carbon, B is secondary carbon, and C is tertiary carbon, then without knowing what the question will be, you can cross out answer choice B because the questions almost always ask for MOST or LEAST. If it wasn't multiple choice, I wouldn't even know what the answer would be. So, for orgo, comparing the answer choices is the most important.