How do you become best friends with a older girl at school?

there is this girl that I want to be best friends with. Shes in 11th grade I'm in 10th she doesn't know me I don't know her. I plan to ask her if she wants to hang out after school. how should i and Do i become best friends with her.How do you become best friends with a older girl at school?
if you have classes with her, then talk to her and ask her to study with you. then after you finish studying just talk and youll hopefully become friends. Don't rush a friendship,first become friends with her, if she seems really nice, you'll just naturally become bestr friends. THere's no such thing as saying ';you're going to be my best friend ok?'; you know?How do you become best friends with a older girl at school?
beiin best fren depends upon the comfort level...ryt now atleast introduce urself to her..wenever u meet at ur school pass a smile n den go to next step...talk to her...be wat u r...don fake...try to understand her feelings n make her feel comfortable wid u, try to understand her problems n solve them..den only u can be best friends...u know the basic things in ur life u do can help u...u don need special steps or training
Ask her that can you be her friend. If she say yes, ask her whether you 2 could hang out with each other sometime. Get her phone number and you 2 can know each other better. If she doesn't want to, you can only say ok and just walk off thinking to have another friend.