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Make notecards for all your classes. Study quite frequently, but make sure you don't overdue it. Keep an agenda and stick to it.
Go through the chapter with note cards and write definitions for all the words in bold print or italics. Answer questions at the end of every chapter. Most teachers use the tools they get from the textbook company to write tests. If you answer the questions in and after the chapter then tests will be no problem. Understanding concepts is much easier when you understand the language.
THere is not easy way in my opinion to do this. You really need to dedicate focused time on these classes.
Check out http://mnemotechnics.org if you want to find out how to memorize the concepts well.
I'd recommend that you look into youtube clips that explain the concepts visually.
Also consult as many sources as you can because each source explains things differently, and some sources will help you more than others.
There is no question that A&P 2 as well as Algebra are both challenging courses. You are expanding your knowledge and synapses in your brain. I would suggest finding a study buddy for at least one of those classes. You can look at the material together, discuss, look at possible test questions. Often when two of you who are the same age explain and discuss things with each other, it becomes much easier then just listening to a professor.
I wish you well!