I am a chemistry tutor. The best way to study for chemistry exams are practice doing problems. I know this sounds long, but chemistry is mostly doing problems out. This is what I suggest you doing:
-Create mindmaps for lecture notes during the lecture.
-Preview, PR, Activate very quickly (the textbook)
-Do the work problems at the end of the chapter.
-If you cannot solve a problem, find the area in the textbook that explains that problem, rapid read it.
-Review your mindmaps before the exam.
With math, chemistry, and subjects like that, you just HAVE to do problems to prepare for the exam. I've found that PR improves the info consumption speed, esp when you're referring back to the chapter. Chemistry is a practical science. Good luck.