Δε θα φτάσεις εγκαίρως στο σχολείο.

English Translation

You are not going to make it in time for school.

Better and more literal translation might be “You will not arrive on time at school”
The given translation “You are not going to make it in time for school” could be better given as “Δεν πρόκειται να φτάσετε εγκαίρως για το σχολείο”