What is the most important thing that I can add in my CUET PG exam preparation plan?

Well it all depends on the individual. Some students takes time to prepare for CUET PG exam, about 6 months. But yes you can do the preparation within 2 months also by executing a proper plan and making best of your ability.

Some tips for  CUET PG exam prep:

Understand exam format, make sure you have good understanding of computer, choose test center that is convenient for you, arrive early on center.

See, solve as many previous question papers and it is advised to allocate time to yourself while solving the paper.

It is advisable to start solving CUET PG question papers as part of your exam preparation at least 4-5 months before the exam date. 

It is conducted once a year. And it typically held in month of March or April. The exact date is announced on NTA a few months before exam