Hey Rakesh! Unfortunately you won't get Heritage with CSE / IT but definitely you can try for other branches. 

Heritage Institute of Technology, Kolkata (HIT-K) was established under the aegis of Kalyan Bharti Trust (KBT) in 2001. KBT was founded by 21 industrialists of Kolkata to give back to the society, their immense managerial experience. The main objective is to prepare dynamic and caring citizens to meet the challenges of a global society while retaining their traditional values.

18k is the closing rank….According to your choice of trade see the cut off list of 2018 as new cutoff's not been released.If you want to go to IT Streams then their cut off rank will be around 6k this year. With 11k thousand rank you may get the college but rank is not specific.