NDA Eligibility

See, it is upon the doctors of the Army if they think that it is not much of a problem, they will select you but if not then they will declare you medically unfit.

See, both of these exams are entrance exams. For NDA and CDS, no particular percentage is required. You can take CDS only after completing CDS.

Yes, Computer Science students are eligible for the SSB.

No, stammering candidate are not eligible for NDA, they will be out from the medical tests.

No,
Minimum qualification for appearing in NDA written exam is to pass class 12th with 60%. Do not try for graduate entries.

According to your question, yes, definitely you will be allowed to appear for SSB and even to be selected for it as well. SSB has nothing to do with your medical condition, if you have qualities of an officer then you will get selected. Moreover once you clear SSB the task of checking your body well-being is with medical board. If they found any medical problem then you would be rejected. For checking the medical condition accepted, I advise you to Google it and see it from official site. They will provide you with all information.

You need for pass in all your exam for being eligible for exam.

Yes, definitely, you are eligible man.

Only male candidates between the age of 16.5 to 19.5 years passed or appearing in class 12th are eligible to enrol for NDA exam conducted by UPSC. Moreover, you should have minimum 60% in class 12 to apply for it, also if you want to apply for AIR FORCE, then you need PCM in +2.

Class 12th passed or appearing and between 16.5 to 19.5 years old male candidates are eligible to enrol.