Hey,

Coaching materials are designed as such to help students to prevent cumbersome theories or portion which don't come in the exam.

The coaching material filter out the portion important and present it in a way that helps one to get used to the concept and numerical easily.

There is one condition you need to choose a coaching material whose package are worth the pay.

https://learn.careers360.com/knockoutfull-jee-main-april/

Above I have given you the link to Career 360 ITT JEE preparation.

Hope that helps.

Thank you.