I have admitted in Jaypee Noida(sub-com.sci.),LN Mittal Jaipur& SASTRA Tanjaur(sub-IT).Whitch should I prefer?

Choose the institute you know better, Also discuss with their alumni if you know anyone.

ln mittal would be a better choice as it is better in terms of faculty and the students admitted. Jaypee is also a good choice but the recent spat over certification by HRD min. marks it down

You should evaluate other parameters before making the choice and not try to compare the quality of education in them. Getting good education also depends upon the student. One cannot directly comment on the quality of education from any institute.