Assuming "It was interesting/amazing to see" refers to the reasonably recent past, and assuming the school is still in existence and is still teaching math in a fun way, both sentences are correct as they stand.
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vcoltsShould Ex 1 be the school "had" in order to keep things consistently in the verb form?It's not necessary.
vcoltsShould Ex 2 be "school found", not "has found"?No. 'Had found' and 'has found' are both fine.
vcoltsDon't we learn to keep the tenses the same? (ex. past & past)Only if it's necessary in the context.
vcoltsDon't we learn to keep the tenses the same? (ex. past & past)Why does it not apply in these cases in terms of grammar?If you are describing something that you heard/saw/etc. in the reasonably recent past, and that something is still the prevailing state (or is assumed to be), then you can use present (or present perfect) tenses to describe it. For examp
vcolts I don't see such a thing on the list of exceptionsThey are not exceptions to anything.
vcoltsBut what do we call it?Sorry, I'm afraid I don't know any specific name for this pattern of use.