GEC Bhavnagar Requires 45% in 10+2 with PCM and selection is based on GUJCET or JEE Main scores.

And Engineering College Ajmer Admission is through REAP or RPET and requires a minimum of 45% in 12th with Physics and Maths. So you are eligible for both.

explore the relevant entrance exams (JEE Main , GUJCET , REAP /RPET, etc.) and their application processes.

Hope it helps!!