After reading your discussion, I realized that you are confused how to study and get good marks.
It's really a serious problem, and you have to solve it as soon as possible, though you can get good marks.
Here are some of the tips that I would like to share regarding this such as make sure that your base is clear on that particular subject. If it is not, then you should clear it, otherwise you may face problem till the end. So it is really essential to solve it quickly.
Google is one of the finest resource to get things where you get one thing in a multiple way along with the structure. If you get things in a structured format, then I am sure you will never get forget things quite easily.
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