Answer:
Well . . . (you would first have to pass the vocabulary list so it can be correct)
my interpretation:
A
1. baja calificación
2. pasar de grado
3. copiar
4. distraído
5. ausentarse
B
6. holgazán
7. laborioso
8. cordial
9. aborrecible
10. sobresaliente
C
I think it's a bit difficult here, so dunno if it's entirely correct.
11. L
12. L
13. I
14. L
15. I
I dunno if you can edit your question or, if you can write, here in the comments the vocabulary list, and thus be able to correct A and B
