It took me a while to get this one correct, and it's because I found part of the descritpion to be ambiguous/unclear - so I'm posting this clarification which hopefully will help anyone else who has the same misunderstanding.

"if a student has got satisfactory marks, the scholarship is not given, "

I read this to mean "got ONLY satisfactory marks" but my solutions were rejected.
Once I modified my solution to treat it as "got ANY satisfactory marks", the solution was accepted.