Bangalore

Based on what I know, Christ is better, but you need to look around more. It has good placement records. 85% students placed. 28 and 12 LPA are the highest and average package offered.
TCS, Infy, PWC, Genpact, KPMG, Accenture, Reliance Jio, Shell, Indus Tower, IBM recruited the students.
Team lead, Sr. consultant, project manager were the roles offered.
Placement coordination is very good, it starts in September.
If the students do not get placed, they have an option to stay in the college hostel and the college helps in placement.

For CSE, Galgotias University would be a better option.

Hello,
Business design in Mumbai is a better option than business design in Bangalore.

Alliance University is best option as it give students to all time work so that students study whole day instead of resting in the hostel.
this university enhance the overall performance of the students so you may join this university.

Indian Institute of Science and Jain College.

It depends upon your son's caste. During option entry after verification of documents, you can enter the top graded colleges from the top with as many number of college entry can be made. Your son can get a good college. All the best.