Reading

The more you read, the more you realise that there is more to learn.
Have you been in a situation where you study but still feel like you haven't read anything? Don't worry, it is simply because you cannot know everything, and that is the fact.
But keep going, keep studying, and try to study everything, even if you know you cannot know everything. It will help, it is better than leaving some pages of your notes unread and telling yourself that a question won't be asked from that part in the exam. You may be shocked.