Hello,

Yes, you will be eligible to join NDA if you qualify in NDA in second attempt. However, at the time of SSB interview you will have to provide requisite educational certificates on the first day of SSB interview. If you have cleared the SSB interview and the medical examination you need to submit requisite educational documents at the academy. So if you manage to obtain educational certificates submitted in the institute you will join to pursue Engineering then you will not face any problem. If you cannot obtain the certificate then your candidature will gets cancelled.