Hello Gautham,

The JEE pattern has changed this time, also the level of question has been changed. Thoroughly stuying the previous year papers will definitely make you qualify the exam, but getting 150 is quite tough by studying only previous year papers. What you can do is solve thoroughly previous year question papers, appear for mock tests and identify your mistakes, identify the weak topics and then start preparing them. If you are adopting this strategy for JEE 2020 January exam, this strategy is quite tough, however, aiming for the April atempt, you can very well score 150+ if you follow this backward approach.

Hope this Helps

For more JEE preparation guide kindly refer the below article:

https://engineering.careers360.com/articles/jee-main-preparation-tips