Should I review a Paper of NonSci journal I am researcher in computer science in India. Very recently I got an email stating that my work is great and they want me to review research papers.
I check about the journal. It is not SCI indexed journal (and it is a paid journal). Now I am not sure should I review a paper from such kind of journal. Will it be bad for my reputation?
They want your free labor. I doubt that there is a real person at the journal who thinks your work is great. I would say no, without even bothering to answer this spam request.
If they actually sent you a paper and it looked really interesting to you and worth your time, then you could consider saying yes.
Neither answer will affect your reputation in any significant way.