Even some of the people who use 'were' with 'I' use 'was' with other subjects. It is always correct to use 'were' in such cases, though it may sound stilted to some speakers.but how about when the subject is not I, but a city, a car, etc.?
For example, a sentence: if the country was destroyed by a monster, we would all flee.
Would it be considered colloquial and be better if I changed WAS to WERE?
It's a little strange. I imagine that what you meant was
Even if I didn't ask this question, it would make no difference to my academic results.
There is nothing grammatically wrong with this, but, as written, it implies that you regularly ask this question (and perhaps you do).
If, however, you intend specifically to refer to a question asked on a single occasion in the past, then, naturally a mixed third conditional
Even if I hadn't asked this question, it would make no difference to my academic results.
would be the appropriate choice if the academic results were still pending, or, alternatively, a paradigmatic third conditional
Even if I hadn't asked this question, it would have made no difference to my academic results.
if the results were already known at the time of utterance.
The choice is yours!