i get up at 5.00am for school what time should i go to bed
You should get around 8 hours of sleep so around 9PM or so. But that is early so maybe 10 at the earliest. Now if you don't care about school, go to sleep whenever. You'll have enough time to sleep when you're dead.
8 PM, you will feel better rested. I got up 2 minutes ago and went to bed at 10:20. I don't feel well rested with 8 hours of sleep. That's just me, go to bed when you feel like it.