See RRB in general have a generalized pattern among all of it examinations. So if you prepare for RPF SI it would be more helpful for you to clear RRB Group D. I would recommend you to target the examination which is a level harder than what you target and believe me this increases the possibility.
If you see the selected students in RRB Group D most them are the students of SSC CGL. They crack RRB as well as SSC but didn't go for RRB. But as they get a lot of marks the cut off rises. So you have to prepare well for the examination you will obviously be able to clear the examination. Now if you don't have RPF SI preparation then I would recommend you to make your base solid and do some previous year question papers in order to have a idea of RPF SI examination. If you have good foundation then you will definitely crack it.
For study tips of RRB Group D you may follow the link provided below:
https://competition.careers360.com/articles/how-prepare-for-rrb-group-d
I hope this answer helps. All the very best for your future endeavors!
Result | Application | Eligibility | Exam Pattern | Admit Card | Answer Key | Cutoff
Eligibility | Application | Exam Pattern | Admit Card | Answer Key | Result | Cutoff
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