I have given my class 10 exams and i want to join IIT after 12^{th. how should I proceed if carry on with both my general classes along with my coaching class.}

@ nitismita 
as u given the class 10^th exams , then donot waste time waiting for the results , if your foundation are clear for class 9^th and 10^th then u can proceed for the 11^th syllabus ..
otherwise go through the 9^th and 10^th PCM part again as it will help u in understanding 11^th syllabus better .
for IITJEE self study is most imp. 
whatever notes are given in coaching,, do read it carefully everyday , 
and in case of any doubt , immidiately clear it , beacuse your doubt will be asked in the exams ..
1- prepare a schedule to work atleast 5-6 hours per day for iitjee ..
2- folow hcv for phy and ncert for chemistry and maths ..
3- do sleep and maintain well as your brain have some max. capacity also ..
4- so, donot stress up your mind , even for now ..
5- do solve numericals and not give all the time to the theory part ..
6- u can get askiitian self study course also , they are hjighly benificial ..
so, if u will do practice properly in these 2 years then for sure , u will get into any one of the iit ..
no doubt in that .
just keep the concept clear and move ahead ..
ALL THE BEST