I believe at a rank of 720 in NIMCET, being from General Category you have bleak chances in securing a seat in one of the 31 National Institute of Technology. The Total seats in MCA itself are around 850. However besides NITs there are many good GFTIs like BIT Mesra, State Universities and other institutes like PEC Chandigarh which offer MCA Courses. Do keep an eye on the counselling dates and procedure. For more infomation do follow the link below

https://it.careers360.com/articles/nimcet-participating-institutes