Sir/mam i got 15062 rank in ggsipu cet b.tech 2013 and belong to dobc category and got rank 30 in Gautam Buddha univ. which one i choose?

My preference for ggsipu is as follows cse>civil>eee>ece>chemical>then any other , but i also have a option of gautam buddha university where i can easily get Mechanical branch . so plz suggest what to take and for what colleges in ip i should leave my option of mechanical at GBU,greater noida ?