When I have Ravenbloom Student and I use a repeat cost does that count as 2 separate spells?

No, using the Repeat keyword does not count as playing two separate spells.

According to Rule 820.3.a: "Regardless of the number of times a spell's instructions are executed with this keyword, the spell is only Played once."

Because Ravenbloom Student triggers specifically "When you play a spell," it will only trigger one time when you play a spell with Repeat, even if you choose to pay the cost to execute its effects a second time. This is also confirmed by multiple Riftbound FAQs (such as FAQ #594 and #8929), which clarify that Repeat modifies the spell's resolution but does not create multiple instances of the spell for the purpose of counting or triggering card abilities.