Hii Pranesh,

To Get get admission in IIT One is have to crack JEE advance.

one cn apper in JEE advance only after cracking JEE main for maximum 2 times. one t the running of year of 12th and one is next year to 12th.

As every one know syllabus of JEE Advance is of class XIth and XIIth.

but basics begins from class 9th.

At this time she will have to clear all the basic concepts of Physics ,Chemistry,maths.

tell her to focus more and more on mathematics.Dont't run after marks.

There are so many coaching centers or Intitutes you will find near you which starts prepartion for JEE advance from class 9th.so you can join them.it wil be too much beneficial.

other wise you can join online courese of FIT JEE or ALLEN or AKASH or any recognised institutions.

 for more informtion please go through the given link-

             https://engineering.careers360.com/articles/jee-advanced-exam-pattern

hope you understand.

thank you