1. “At what time is your English class?”
Answer (I don’t know your schedule so change what is in the brackets): “Mi clase de ingles es a la(s) [number] de la [tarde/mañana]” (my english class is at [number] in the [afternoon/morning])
2. “At what time does school start?”
Answer (put the time your school starts in the brackets): “la escuela empieza a las [number] de la mañana”
3. “At what time does school end?”
Answer (put the time your school ends in the brackets): “la escuela termina a las [number] de la tarde”