Dear Sir/Madam,I am a 11th grade student aiming to get into the IIT.I am doing a Reaonance Mains level coaching but their advance level coachig is out of our reach.So will be able to crack IIT?

dear student 
mains and advanced are completely diffrent , mains ques may be easy but advanced cannot , in advanced you cannot guess any ques like mains , and in every ques u have to show your understanding . 
so, try to go a little biut higher level ques and solve it , and if u cannot solve ask your teacher . 

you can use online coaching website for prep as well . 
regards