Dear Aspirant,
JEE preparation cannot be done only through a single source. The source you are mentioning is a good option and you can refer to it whenever you want but along with it you should get some study material from other institutes as well for practice. NCERT books and some other famous books like HC Verma have their own advantage. So, you should consider all the options. Gain as much as you can from multiple sources to perform well. JEE is a highly competitive exam so you need to do your preparation keeping that in mind.

Check these links out for reference:
https://www.google.com/amp/s/engineering.careers360.com/articles/best-books-for-jee-advanced/amp

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-preparation-tips/amp

https://www.google.com/amp/s/engineering.careers360.com/articles/best-books-for-jee-main/amp

Hope this Helps!
Good Luck

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