if i get selected in the prreparatory course in iit 2010 should i write and clear iit 2011 and then get into actual 4year course or i can directly get in without writing iit 2011.please reply

Yes you can write JEE again and join in any 4 yr/5yr u wish to

or else after prep. course, based on your performamnce during one year study at IIT, they may allot you into any 4yr/5yr course

I suggest you to give IIT again in 2011, as u may geta gud branch if u secure a gud rank

all the best

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regards

Ramesh