One — what does it actually teach?
Ask for the subject list, not the brochure. Two courses with similar names can be very different: Computer Science and Information Science overlap heavily and employers largely treat them alike, while Robotics and Mechatronics differ in how much mechanical, electronic and software content you get.
If the subject list bores you on paper, it will not thrill you in a classroom for four years.
Two — is this qualification employable on its own?
Some courses are complete in themselves. A diploma, an ITI trade certificate, a B.Sc Nursing degree or a B.E all lead to work directly.
Others do not, and the honest ones say so. A bachelor degree in biotechnology opens relatively few doors without a masters. Practising as a psychologist requires postgraduate study. A B.Ed alone does not qualify you for primary-school posts. None of these are bad choices — but they are five-year plans wearing three-year clothes, and you should enter them knowing that.
Three — branch first, college second
Families routinely pay a large premium for a better-known college and accept whatever branch is available there. That is the wrong way round.
The branch decides what you study every day for four years and what work you are qualified for afterwards. A student in the branch they wanted at an ordinary college is usually better off than one in a branch they dislike at a famous one — and much better off than one who paid a management premium for the word "Computer" in a department they had not looked at.
Four — is it recognised?
Every course has a body that decides whether a college may offer it: the All India Council for Technical Education, the National Medical Commission, the Indian Nursing Council, the Directorate General of Training, and others. Each publishes a list of recognised institutions.
Check the list, on the regulator's own website, before paying anything. A degree from an unrecognised institution is not a degree, and this is the most expensive mistake in the whole process.
Five — what is the real length?
The advertised duration is often not the commitment. Medicine is five and a half years including a compulsory internship, and specialising adds several more. Physiotherapy is four and a half. Chartered Accountancy takes three to five years assuming you clear each level close to first attempt, which most candidates do not.
Add up the years honestly, including anything required before you can actually practise, and check that the family can support it for that long. That is a better conversation to have now than in the third year.