CBSE 10th

Hi,
It will be difficult to get calls from most of the IIMs. Gentle rally the cut off is around 90+ percentile. But you might get calls from recently opened IIMs like IIM-Jammu, IIM-Amritsar, IIM-Bodhgaya.
All the best.

Surely not, because 88 percentile is not much good for NIT Trichy and also 75 % and above is required in class 12th.

Yes you can get admission in the college, but the condition is to clear the eligibility. First of all, decide the course you wish to join to check its eligibility. Good Luck.

If your son is interesting in doing hotel management courses, Than National Council For Hotel Management
And Catering Technology ( An Autonomous Body Under Ministry of Tourism, government. Of India) offers the B.Sc Hospitality and Hotel Administration (HHA) course can be the best option for him. The B.Sc HHA course is 3 years of duration course and teaches in leading IHMs of NCHMCT. The admissions for B.Sc HHA course are based on ranks obtained in NCHM JEE conducted by NTA. The eligibility criteria of NCHM JEE is 10+2 in any stream.

Not necessary. The concerned Institute or even company set its own CGPA criteria for placement offerings. Hence, if someone meeting the Institute/Company CGPA criteria than he can sit in the placement drive.