how do you say "he failed his classes"

[sfu]

1. how do you say "he failed all his classes" ?

2. and how do you say "repeat" as in 'he never repeated his classes'?

3. also how do you say average, as in "average grade"?

[%sig%]

[Terence]

2. lau4 baan1留班, or lam6 baan1(characters not sure)