学霸(xuè bà) means the students good in MARKS, gangs in study, boss in exams.
Usually they're also teachers' pets.
However, some of them are also good at games or sports. So these are really annoying people!
A(Xueba): I've reviewed a lot but I think I will still die on the exam today.
B(Normal): Such bad liaryou are a Xueba(学霸) that never had a mark lower than 95/100