If you are talking about the BSc in CS or IT, then with this marks the competition can be very high and probability of getting a seat can be really low. Now if you have qualified an entrance like Gujcet and wish to get admission to the course of BTech in CS/IT then the rank will only matter and not your 10+2 score.

As you have mentioned admission on the basis of score, I am presuming you are talking about BSc IT/CS. The colleges you can look for are-

St Xavier's College, Ahmedabad

This is the only college in Ahmedabad which offers the course of BSc in Computer Science. Apart from this there are other colleges which are situated outside Ahmedabad, this are-

Shri Maneklal M Patel Institute of Sciences and Research, Gandhinagar

KBS Commerce and Nataraj Professional Sciences College, Vapi

Shree Ramkrishna Institute of Computer Education and Applied Sciences, Surat

VP and RPTP Science College, Anand

Government Science College, Chikhli

BN Patel Institute of Paramedical and Science, Anand

For more colleges consider the link below:

https://university.careers360.com/colleges/list-of-bsc-degree-colleges-in-ahmedabad?state=Gujarat&branch=Computer%20Science,Information%20Technology

I hope this helps. Wish you a great eve!