How to wake up early?

[SirenDep]

I have to go to work this year in a school. It starts at 8 in the morning. I have to leave the house at 7, to take public transport. I have to get up at 6.30. It's one day per week and not every week. Should I form a sleeping schedule? I don't have a standard sleeping schedule. I usually sleep at 2-3 o'clock after midnight, sometimes later and I get up at 9-10 o'clock in the morning or later, depends on what I have to do. I'm not a morning person, so when I wake up I'm in a really bad mood, I feel weak and groggy. The problem is that I have to be there at 8, I have to look presentable and I have to be awake, polite, engaging and generally functioning. Any advice?

Updates

+1 y

What to do to stop feeling awful or at least to feel a bit better when I wake up?

[DreamHope]

Go to bed at 10pm.
Leave the blinds open, at least a bit.
When the sun rises, light will naturally wake you up.
Set a nice soothing alert on your phone to wake you up. You will probably snooze this. Have another, upbeat alert set for 10 mins later.
Have a shower as soon as you get up, this will waken and freshen you up for the day.

[SirenDep]

thanks! though I doubt I have enough time to shower in the morning. And the last time I slept at 10 I was 12..

[DreamHope]

You're welcome :)
I start work at 6am every day, and trust me, if I don't make time for that shower, I fall asleep on the job. Just set the alerts early enough to allow time for a shower and a decent breakfast.

[SirenDep]

should I wake up at the same hour every day? is it ok to get up early only once a week when I have work?

[DreamHope]

Ideally, you should get up at the same hour every day, for the sake of both your work and your health.

[SirenDep]

I want to set your comment as more helpful but I can't cause you're anonymous.. could you change it?

[DreamHope]

Thanks for MH :)

[SomethingWicked]

Go to bed early, drink lots of water before bed. Set 12 alarm clocks.

[jacquesvol]

No coffee after 6pm
Go to bed earlier
Use an alarm clock
Drink coffee at breakfast.

[Klaatu51]

just sleep earlier and set your alarm clock at 6:00 or so to be ready XD

[yaddayaddayadda02]

Go to bed earlier.