Fat marks!!

Is it true that upon reevaluation, 5 marks is the maximum you can gain since the teachers are hesitant in giving more marks even if u deserve it (as it can raise eyebrows from their higher ones)?? What's ur personal experience?

This is what I heard from a lot of people. I have 2 subjects in which I should get around 10 more.

Should I talk to the proctor about it ?