Dear Devraj,

In order to prepare in last 30 days you should focus on revision. 

Focus on the topics which carries more weightage in the exam.

You can go through your notes if you have prepare them.

Refer previous year papers to understand the level of the questions. 

You need to solve as many as mock test series for your practice to analyze your preparation level and to know your strength and weakness. 

It will also help you to work on your time management. 

All the Best!!