There’s a hierarchy of what kinds of study materials will be useful to you in preparing for your exam:

1. The most valuable are mock tests and exams which are intended to be identical in style and form to the test you’re actually going to take.
2. Next are problems , given in assignments, textbook questions.
3. Finally, self-generated questions or written notes based on the material.

This hierarchy of practice is known as transfer-appropriate processing. This basically means that the more your practice resembles the exam, the more your practice efforts will transfer into actual results.

Memorization matters, but it’s more often as a means to understanding rather than an end in itself.

This means that deeply understanding the core concepts behind any exam you study for should be a top priority.

For understanding a concept you can use feynman's technique, in this technique , one tries to put out any concept or topic that you want to study on a piece of paper as if you are explaining it to someone , and by using Simple language and terminologies.

Anxiety is another hurdle for your studying ability. It’s both harder to concentrate and the stress makes it harder to remember things, even if you could.

The solution is to make at least some of your studying sessions a full-blown simulation of the exam.

The benefits of these stimulations are:

• You increase your temporary anxiety while studying, which makes it easier to recall the information in stress conditions.
• By exposing yourself to the exam situation you’ll be less anxious when the eventual test comes.
• You’ll actually know what your performance is likely to be on the test!