Except that not all school teachers (who are already overworked)
have the patience to discuss with you beyond the depth required by
the basic H2 syllabus (which is increasingly insufficient for
the increasingly difficult H2 Chem exam).
This is where online discussion forums, together with
self-learning (eg. both online and via higher level materials,
such as the
Uni books I recommend, the ones I
labeled "advanced" on them) can play a useful role.