CBSE

One of India's top-ranked engineering institutes is Thapar Institute of Engineering and Technology. Based on your results from the class 12 CBSE board exam, your chances of being admitted to Thapar University's CSE programme are favourable. However, admission to Thapar University is contingent upon a number of criteria, including JEE Mains results, class 12 board exam results, and the university's online test rating. In order to assess a candidate's eligibility for admission to the institution, the university also has a counselling process that considers all of these variables. 

Entrance and Merit based selection and additional qualitative factors are used at IMS Noida for BBA admissions.To be eligible for the admission applicants must have Class 10 and Class 12 from a recognised board. Given below the procedure for selection in BBA courses at IMS Noida:Procedure for Selection-Merit in the results of the Class 12 exam determines admission.Candidates must apply and appear for JET Exam and score good.IMS Noida shortlisted the applicants on the basic on their performance in Class 10 and Class 12. The final seat is allotted to the applicants on the basic of their merit in last qualifying exam and JET exam

Yes, with a 75 percentile in the CBSE Class 12, you have a strong chance of being admitted to the IMS Noida programme. Although the specific cut-off for the BHM programme is unavailable at IMS Noida, a score of 75 percentiles in the CBSE Class 12 is typically regarded as competitive and puts you in a strong chance to get selected. Additionaly, the institute conduct an entrance exam followed with a interview round for admission. So, candidates also need to score good in JET exam.

ICSE is very tough whereas CBSE is a lot easier than ICSE. ICSE students definitely will have higher intellectual than CBSE students. So, till class 10th go for ICSE. In class 12th, you can switch to CBSE if you are planning for JEE, so you don't have to focus on class 12th as the CBSE syllabus is very easy. You can completely focus on JEE needs.

In my opinion I would suggest you to choose CBSE rather any other state board. As everyone chooses CBSE, so there will not be a problem in future.First of all of you are aiming for NDA then choose physics and mathematics and also you should start preparing good for your English. NDA written is less tough than NDA SSB. So do focus on your physical and group discussion skills. Do solve a lots of reasoning problems as majority gets rejected on the first day of reasoning and GD. But I am not advising you to focus on SSB only do focus on your boards and NDA written paper.Hope this will answer your question.