They are not correct, just a slight grammar change, they can read “Do you remember the first day we met? It was in the Econ class.”
The net set of sentences is wrong; it should read “there should be no problem paying for this”
The preposition “for my braces” modifies doctor, this is because it comes right after the noun at the same time it can modify “have an appointment” the preposition “for” modifies the noun before it. Therefore “for this class” modifies “book”.
The first is correct, there is no need to use which/that, however in the second the meaning still remains the same. Example: my ideal holiday is (that/which) is taken along the coast.
the preposition only modifies the object “noun or pronoun” when it comes right after the noun or pronoun. Example: the fish with the red gills.
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