How to practice for theoretical papers ?

Since English is my third language I find it very difficult to study for discursive or theoretical papers. I am going to sit for p1 this session and need some advice on how to practice for theoretical questions . If I write down all the answers it takes so much time so therefore I only choose to memorize them instead of writing them down. I am also learning vocabulary by referring to dictionaries to understand the meaning of new words. I am also planning to sit for p2 and p3 so it is not possible for me to practice question by writing them down. Is there any other way I could memorize theoretical answers and not to forget them ? or should I write them down

Any advice will be appreciated.