School and college

I had a class, where if you managed to get a C you were considered by the others as super smart. If you were an overachiever and somehow managed to get a B, you were considered extremely intelligent..... and for the only soul that managed to get an A, we all thought of him as genius, and not being from this planet.

Everything has become really harder, but the grades are still C's. Yeaaaah.

Wtf kind of problem is "2x + 2x = 4x"? It's just a fact. X can literally be any real number!

What is 10th?