Dear Viraj Rathwa,

                                   If u get preratory then go and join in preparatory courses..see what is the procedure i will tell u clear,and the schedule is like to be as follows

1.If u join as preparatory course in that year u will have some courses that is Maths,Physics,Chemistry and english these are the cour courses u will be having in preparatory course in IIT..

2.you  have to pass in all the Four subjects  bcoz you will join as 1st year after preparatory course so in order to get a good branch in next year i.e., after preparatory course and if u top in the preparatory course batch students then u will be getting remaining yester tear branch to u..so if u score top in among the preparatory course batch students then u may get very good branch..

so preparatory course means in that year you are not going to join as a 1st year student but u will join as preparatory student and after completing preparatory course you will get to join as 1st year student after preparatory course over 1 year...this is all for u basic shd be strong.. and also in that preparatory course you will so much knowleddge about life @IIT so in the coming year u will join as 1st year then u will easily crack in 1st year..

So go and join in the preparatory course if really dont wanna rpeat JEE exam..