Snape was a Slytherin when he was at Hogwarts, and like many students in that house, he excelled at Potions, the Dark Arts, and Charms.
Professor Slughorn, his Potions Master, was very fond of both Snape and Lily, so they were both likely a part of his elite student group, the Slug Club. However, it's never clearly mentioned in the books, probably because Slughorn only liked to show off the students he was most proud of.
The professor questioned Snape's loyalty, especially after he killed Dumbledore, so he likely wouldn't have highlighted him even if he was one of his favorite students back in the day.