Here are some of the preparation tips for JNU entrance exam you can prefer given below:

Go through with the previous year papers as it will help you to know the level of the questions.

If you are planning to apply for Graduation programme then go through with the NCERT books for the particular subject & if you are planning for Post graduation then Go through well with your graduation syllabus for the particular subject.

Make your notes on the important topics.

Good Luck!