I have jee advance on May 20 If I have start now,can I get seat in IIT

Yes of course but but but the need and first call is of the faith that you should have in

You apart from all the stratgy, make sure to do not dare to touch those topics in which you are not clear of concepts

Sorry i left it incomplete  look i have been through such a phase so here the experience is speaking remember do not panic u can do u know ur parents know and if they dont you have to show to show them that u r something remember this jee advance is not 

About learning formulaes so focus more and more on grade 12physics and maths portion