Hello Rashif, 1213 rank in JCET is not enough to get you a seat in GCET Jammu or GCET Khanderbal if you are from general category. Civil brank has the lowest cutoff while the cutoff increases as you go to electrical, mech, E&C, CSE departments. Past year final round cutoff of different branches in GCET Jammu was: 

Civil - up to 200

Electrical- up to 350

Mech, E&C - up to 600

CS - up to 800