It totally depends on you whether you want to join any coaching institute or you want to do self study.

You can follow below points to crack your exam-

1- You should be aware of the syllabus of the exam and exam pattern. So, you can prepare accordingly.

2- Refer past year problems for your practice.

3- You should make your study plan. So, you can complete your syllabus and you can get time for revision as well.

4- You should work on improving your Grammar Part, as the paper is all based on English Grammar.

5- Make reading your Daily habit.

6- Read newspapers, magazines, good articles on daily basis.

7- Apart from reading, you have to solve mock test papers. 

All the Best!!