CBSE 10th

65 - 70 minimum percentage to take commerce stream.

Yes, you can enter in the university after the 10th. Amity University, LPU, Chandigarh University, etc. are offering various Diploma courses on the basis of 10th class.

The minimum eligibility criteria for pursuing Hotel Management courses is 12th in any streams. However, you can pursue some one-year duration Diploma level course like Diploma in food production.

Yes, he can apply. The eligibility criteria of Diploma in Aeronautical Engineering is 10th passed or appeared. Please write about the college name for more details.

No, JB Knowledge is the worst college in Faridabad. Don't take admission this college.

IIM Ahmedabad has 2 stages for shortlisting students:
Stage 1 : Students are shortlisted for WAT and PI round on the basis of a composite score which contains weight-age from students CAT score, Academic records and academic diversity.
Stage 2 : A final merit list is prepared on the basis of a final merit score which has a weightage from various parameters like CAT score, academic rating and performance in GD and PI round.

FMS University of Delhi offers various type of PG Management courses and the minimum eligibility criteria is Bachelors degree in any discipline. Admission in management courses are done on the basis of CAT entrance exam scores. Hence, you cannot apply here.

Please find the attached shortlisting criteria for the course.
https://www.iima.ac.in/c/document_library/get_file?uuid=3c0de5c2-5d78-4849-81ec-af4fd18863e3&groupId=187610&filename=Shortlisting Criteria for PGP 2020-22 batch
Now, technically it is fair to say that you are eligible, but some IIMs give more weightage to 10th and 12th. So, technically you are eligible. My suggestion would be to give your best efforts in CAT that should be the primary goal and leave the rest for afterwards once CAT gets over.