Government & Defence Entrance Exam

Hello, You can apply for both if you fulfill the required eligibility criteria. Check out the basic eligibility below:
For RRB Group D:
The candidates must be 10th passed or have a higher qualification or and the candidates age must be below 33 years. For RRB ALP & Technician. The 12th passed or higher qualification with the ITI or Diploma is required qualification for the assistant loco pilot & Technician post. If you possess the above eligibility criteria, then you can apply for the RRB Group D and The RRB ALP & Technician posts. You can go through the official notification to know more about the RRB Railway recruitment and the latest notifications for railway jobs. All the best for the RRB exams ahead.

NDA and JEE Mains both are the NATIONAL LEVEL exams in INDIA. In both the exams Lacs of students appear, but only few are able to make it. Now the difference:
NDA : Here, candidates have to appear for the entrance in which they have to compete with Lacs of candidates. After that only 80008500 successful candidates get call letter for SSB. NOTE: After clearing that paper still they r not confirmed that they will get admission in the ACADEMY. (Dreams are completely shattered who didnt receive interview call letter. )
From 80008500 only 450 - 500 candidates got recommended n after that in medicals, always there 30% - 35% rejections (means even after clearing all the hurdles u r not going anywhere)
And, again after this, candidates have to wait for the MERIT LIST, in which still some candidates don't receive their call letter. So out of Lacs around 400 candidates only are able to make out through this exam. Even, after this some candidates leave the ACADEMY because of its rigorous training. U can predict the selection ratio as to be 0.03 or 0.04 (Really low! )
JEE: Here, also Lacs of candidates appear every year. N only few of them are able make through it. I am not sure about the round figure of selected candidates for JEE Advance, may be it could be around 80,000. NOTE: Here, whether the candidate will clear JEE Advance or not, the candidate will get an institute. (Still there is some hope)
Now JEE Advance, no doubt its really tough n only few candidates are able to make it. But those who cant they can still get an institute through their JEE Main score. (But in NDA its not like this. )
Conclusion:
Paper level -&get; No doubt, JEE is on top. But if we include SSB n medicals, then there is no match for NDA. Hope this will help u to conclude. ;). .