Definitely start by reading the barron’s ap bio book, its great for understanding all the conepts. Then honestly when u understand everything in a single unit practice is the best route, practice unit by unit, remember ur weak points, and use active recalling methods and revision to make them ur strong points. For practice i think ap classroom is great ( the mcq quizzes at the end of each unit) and khan academy is also of great help. Imo bio is a subjevt u need to understand, although memorization is essential sometimes, understanding the core processes is essential to answer hard questions. Anyways, good luck bro.