Does Ravenbloom Student get +1 might if I play a spell but it gets countered?

No, Ravenbloom Student does not gain +1 Might if the spell you play is countered.

According to the FAQ and Rule 412.1.b, a spell is only considered "played" when it resolves. If a spell is countered, it does not resolve, and therefore it is not considered to have been played for the purposes of triggered abilities like Ravenbloom Student's.

Sequence of events:

1. You cast a spell (it enters the chain).
2. Your opponent plays a card to Counter your spell (e.g., Defy).
3. The Counter effect resolves, negating your spell.
4. Because your spell was countered, it does not resolve.
5. Since the spell did not resolve, it is not considered "played," and Ravenbloom Student's ability does not trigger.

As stated in Rule 412.1.b: "A card that is Countered is not considered to have been played."