Hi,

For B.Tech , candidates have to appear and qualify the Joint Entrance Examination (JEE Main) /Gujarat Common Entrance Test ( GUJCET ).

• Eligible candidates have to fill an application form available on the website of AU.
• 50% of seats will be directly filled on the basis of the marks scored in the JEE Main Exam.
• The remaining seats will be filled through Admission Committee for Professional Courses (ACPC) for which the candidates have to do the online registration for the admission.
• Admission will be offered to the candidates after choice filling, choice locking, seat allotment, document verification and fee payment

And according to 2019,

the cut off in General category:

• 9k for Chemical
• 1.3k for CSE
• 8k for Mechanical

For more details :

https://www.careers360.com/university/ahmedabad-university-ahmedabad/admission

Hope this helps!