First of all i'm going to give you an example of plan you could use my Spanish friend.
You know what you want. That is the most important thing. You want her to be your girlfriend, not your friend or your fuck buddy. You are close friends so don't worry, if anything goes wrong, she will at the very least stay your friend. Do not thing in a pessimistic way. You are going to confidently ask her if she wanna drink a coffee after school. And at this point you will know if she is into you or not.
If she says something like "yeah good idea i'm going to ask [insert mutual friend] if he can come with us", then you know she doesn't want to be your girlfriend, or she is stupid. If she says yes and you are going just you and her, then it is up to you to make it a date. You will have a perfect timing to talk to her and try to get to your goal. Do not suddenly ask her "would you be my girlfriend", but rather say during a blank in the discussion something like "you know we should do this more often, I like spending time with you alone" or whatever. Just feel her, you already did the hardest part which is being alone with her, let your Latin blood speak for itself eksdee.
My fellow neighbor, It's simple, you are friends so she already like you, you need to send her signals that you want her to REALLY like you. But you need to be alone with her, not going anywhere or doing something special. I'm not going to tell you how to look more confident using eye contact and body language, you have plenty of videos and sites to learn it. You just need to be CONFIDENT and look like you know where you going.
If she doesn't want to go out with you, well move on. At least you tried and she will remain your friend, now everything is clear. You can stop crush on her and you will feel better.
You are in this situation: hips.hearstapps.com/housebeautiful.cdnds..
If you open it everything could collapse, or you could manage to put every plate in its place. But if you do nothing, the plates are indeed intact, but they are unusable and you are stucked with a blocked cupboard.
Go ask her out as you feel it, you might be dissapointed by her answer, or you might get a girlfriend. Staying like this will not make things advance, and you are stucked crushing on the same girl, while there is plenty fish in the sea.
Anyway good luck buddy!