If you want to learn definitions and theorems , find out the key words in it , remember and understand the key terms , write on separate place as a word bank for a particular definitions . So whenever you need to reproduce it or write in anywhere first write those key terms on separate space as a rough work .
More you understand the key terms , more meaning you can derive from your definitions . You will feel that you are becoming an expert in that particular field of Knowledge !
You will find this technique very useful because your answer will have all the key terms , only you need to organize in a useful sentence , doesn’t it look like you are developing a story from an outline . Wish you all happy learning !