Dear Aspirant,

I want to tell you that no teacher can assure that you will get admission in IIT's or any good college through JEE Mains. Teachers just provide you help and support. You need to work hard to ace this exam. There are different help books and study material you should do. Exam preparation is a responsibility that should be taken by the student. Only you are responsible for your results. You need to take your decisions wisely about which coaching institute to join and which teacher helps you more.
The teacher you just mentioned might be helpful to you but she isn't the best and infact no one is. No one knows it all.
I am providing you a link which you should check out to kickstart your preparation.
https://engineering.careers360.com/articles/jee-main-preparation-tips

Some references books:
https://engineering.careers360.com/articles/best-books-for-jee-main

Hope this Helps!
All the Best

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