So I am in 6 form in England. There is a girl in the year above.
However, in a week we break up for study leave and I won’t see her again in school. As the year above finish when they leave for study leave.
I think she likes me for a number of reasons
I always catch her looking at me/trying to look at me. We went to a study revision class last week and I started making conversation with her for the first time. I stopped halfway through the conversation to see if she would carry it on with me, she did.
The problem I face is the amount of time we have in school, so not that many opportunities to speak to her. The only time I really see her is first thing on some mornings where she has to stop with about 4 of her mates, it’s on the way to my class.
The other day I looked up to see if she was looking at me and I held her gaze for about 4 seconds of eye contact. Defiantly attracted. During break all the girls in the older year wait in a class where none of my mates or me really go in (mainly because there is no reason to and because they are in their).
The only things I think I can do is either add her on Facebook and start speaking to her on that (however I think it shows low value and shows I am interested in her) or speak to her in school. However I do not know how as there is no other revision class and I don’t know how to speak to her without her mates thinking it’s strange.
Please can I have some advice/tips as I only have tuesday-friday in school.

Please any advice would be appreciated

Ask. Her. Out.
It's that simple dude. Forget the text game. Forget facebook. Next time you're talking, tell her you have to leave mid convo. Tell her you two should hang out sometime. Take out your phone and open a new contact, give her the phone and tell her she should put in her number. Follow up with a text a couple days later to schedule it.