Question

If Tom ... his exams better last year,he... so many problems.
A) passed ... wouldn`t have
B) passed ... wouldn`t have had
C) had passed ... wouldn`t have had

Answer 1

If Tom ... his exams better last year,he... so many problems.
C) had passed ... wouldn`t have had

III type conditinal sentences 

If + past perfect, would have глагол (3 форма)