Hello
B.Com hons is a 3 year undergraduate course in commerce stream. The eligiblity criteria for admission to this course is that the candidate should have passed class XII with atleast 45% aggregate marks.
Most colleges also have eligiblity criteria that the student should have studied Commerce with Mathematics as compulsory subject in class XII

Top colleges for B.Com hons in Ahmedabad are

• Amrut Mody School of Management
• Indus University
• Institute of Commerce, Nirma University
• Faculty of Commerce - GLS University

The admissions are based on percentage of marks secured in class XII or some colleges also conduct their own entrance exams. Head to the official website of the respective college for admission details.
Usually forms are out in April-May for merit based admissions and in February-March for those colleges which conduct their own entrance exams.

Good luck