Nirma university, Ahmedabad is one of the best institutes in India offering B.Tech programmes. To get CS and IT in Nirma University one needs to secure a rank under 450 or 500. For mechanical branch, a rank near 1000 would be helpful. You will have to score above 110 marks in GUJCET, so as to get CS in Nirma University. Try to score around 90% in boards, then scoring 110 marks in Gujcet wouldn't be difficult for you.