Do you still have a test tomorrow?

Nae-il-do shi-heom-cheo? (to younger person or friend)
Nae-il-do shi-heom-chi-se-yo? (to older person or stranger)

It directly means "Do you have a test also tomorrow?"
If you really wanna say "still", just say "A-jik-ddo" at the begging of the sentences.