Unfair Dismissal (and contract violations)

No, it sounds like when he entered the term there was a blank slate and he had no idea where to go from there. So he is doing the same.

Withholding grades in Thailand means nothing, they were probably going to doctor the grades you gave no matter what!

You can't give Pingpong that grade! His dad owns a gold shop and is very rich! "But he didn't do any work and failed all the tests!" Ok, ok then give him a B.