I would first get to know and understand your learning style. Then incorporate methods to ensure u learn the material that needs to be covered. I believe that for Biology having fun experimenting is good for learning. So we can mix baking soda and vinegar to see what happens. We can venture outside and get plants to examine so we can learn. These visuals will ensure that you remember these lessons and can pass any Biology test.
I will also start from where you are whether you are basic or Intermediate.

Life Quote; The heights by great men reached and kept, were not attained by sudden fright but they while their companions slept were toiling upwards through the night.