aprobar vs suspender
English 'pass' an exam is aprobar, not pasar. And suspender is to fail — but also to suspend and cancel.
aprobar
To pass an exam, approve a proposal, or give approval.
He aprobado el examen.
I've passed the exam.
Aprobar = to pass. Stem change o→ue: apruebo.
Aprobaron la ley.
They approved the law.
Passing a law or proposal.
No apruebo su comportamiento.
I don't approve of his behaviour.
Moral approval.
suspender
To fail an exam (Spain), to suspend, to call off.
Suspendí matemáticas.
I failed maths.
In Spain, suspender = to fail. In Latin America 'reprobar' or 'perder'.
Suspendieron el concierto por la lluvia.
They called off the concert because of rain.
Cancel.
Lo suspendieron de empleo.
He was suspended from work.
Disciplinary suspension.
Tricky bit
'Pasar un examen' means to take an exam in some regions, so 'pasé el examen' can be ambiguous. Use 'aprobé' for passing and 'suspendí' (or 'reprobé' in Latin America) for failing.