i got 141/366 in advance and I'm from general could i get top15 iit in cse
You have average chances based on your marks.
To check which colleges you can get based on your marks/rank you can use below college predictor
JEE Advanced College Predictor
To check your expected rank you can use below rank predictor
http://www.engineering.careers360.com/jee-advanced-rank-predictor
Good Luck!!