Pune

Your B.Com admission in based on your 12th marks and for applying at Symbiosis you need to fill their college online application form with is available on their website.

A valid GATE score is mandatory for all M.Tech. Admission at Bharati Vidyapeeth University, Pune. Further, the admission in M.Tech programs are based on University entrance exam. So, you have no chance.

Yes, Refer the link for details: https://www.shiksha.com/medicine-health-sciences/paramedical/course/bachelor-of-medical-imaging-technology-oasis-college-of-science-and-management-bibwewadi-pune-282644

Yes, chances are, you can get admission for B.Com. Make sure to check all the eligibility criteria and apply there. All the best.

To get admission in this college, you have to first appear for the entrance exam, and then appear for the counseling. Only then you will get admission in this college or you can opt for the management quota.

DY Patil International University, Pune is better than Poona college. Please refer to the link provided below for a detailed comparison:
https://www.shiksha.com/resources/college-comparison.

For B.Com (Hons), you've to score more than 65% in F. Y. without any backlogs. First year is same for all the students and in second year you've an option to convert B.Com. Into B.Com. (Hons). If you fulfill the criteria. The admission is done on the basis of 12th marks. The cut off is range between 86% to 90% for general non-Maharashtra category.

You can consider following colleges:
Ramaiah Institute of Technology, Bangalore.Indian Institute of Management Bangalore.
BMS College of Engineering, Bangalore.
PES University, Bangalore.
Christ University, Bangalore.
Bangalore Institute of Technology, Bangalore.Dayananda Sagar College of Engineering, Bangalore.

Admission is based on the marks obtained in class 10th.
Eligibility:
Candidate must have passed 10th standard or its equivalent with at least 35% aggregate marks.
Candidates passing 10th standard from Maharashtra State Board must have Maths/Mathematics (Code 71) and Science & Technology (Code 72) as compulsory subject.
Admission Process:
Admission is through Centralized Admission Process of Maharashtra based on marks obtained in class 10th.