Hello Anand
Using books from Allen isn't such a bad idea actually the more you practice the better for you and more perfect you are I will attach a link that will suggest you tips and other books required for cracking exam so look at it
https://engineering.careers360.com/articles/jee-main-preparation-tips
hope this helps you
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile