Hello,

RRB i.e Railway recruited boards conduct exams for many types of post and eligibility depends on the post which you want to join. Though there are some posts for which after 12th std you can appear but some posts require Graduation. The mode of exam can be online or offline. And the syllabus of exam includes maths, science and GK.  For more details check out the details below in the link

https://competition.careers360.com/exams/rrb-group-d

https://competition.careers360.com/exams/rrb-ntpc

https://news.careers360.com/rrb-ntpc-2020-exam-analysis-for-december-30-shift-1-check-expected-cutoff-here

Thanks and all the best.