It should be tanultok, that's the plural-you conjugation. Tanulok means "I learn".
Putting the ti at the end is grammatically okay, but sounds pretty weird since pronouns are usually only added for emphasis, and emphasised words tend to stand in the front. I would just stick to "Mit tanultok?" here.

It's not wrong, "tanul" means both to learn and to study. This should be reported as a missing translation that should be accepted.