First you study first person and all. Then it will be easy to study. First byheart them and you study about verbs, nounsetc.
First try to understand what is being told in the books. You will have to learn about many many things in English grammar. It is not possible to by heart them all. I'll advice you to converse in English. That will make it easier for you to understand where to put which form of verb or noun or whatever they ask you to do. Next and most importantly, practice English grammar each and every other day