I will give you field tested advice based on the time I was your age doing pick up (I was an upper intermediate PUA at your age) I will give you 3 options that you can choose, but ideally you should combine at least 2 of them, if not go for all three:
1) First option is to do daygame to practice opening and hook game, and date game. If logistics allows for it, he may end up with a woma with her own place. Girls will most likely be above his age - so he will hav to lie up his age a bit till he is 20. No problem.
2) Second option is to build a social circle - that is befriend as many people he can, spot the key connector, put these people in his debt (by inviting them to parties) and eventually snowball this way and get access to tons of home parties. All you need is one home party as sooner or later you will be invited to one, and once you are, invite key people (dudes and girls who are well-connected/host parties often). Then they will owe you, which means you are more likely to be invited to a home party later on. And rinse and repeat. Eventually you will have parties available to you weekly.
This is what I did in high school (I was active in the PU community from age 15).
The benefit with parties are:
- In venue logistics (you can fuck in the basement, garden, free bedroom, bathroom, attic, garden house, and even an iglo... which my friend build in the garden during the winter.
- New girls - easy to hook, you can go straight to sexual framing and seal the deal (which is why I recommend doing daygame next to it, just to get used to opening and hooking).
- Being at parties will grant you social value in your school - both directly since you may invite key people from your school to parties, or you may do high value things are the party, or because you become known as the guy who has access to parties. in high school (at the school itself) it is all about popularity - not you cute innocent flirting. Nothing brings more status than being the party-fixer. PERIOD. During my last high school year, I had so high status that I had my own corner with a coach and people had to ask for my permission to sit there. I controlled everything. I was on a different league than the most popular guy, who knew he couldn't match me, so he kept the relationship of "mutual respect" between. He was the alpha, was the Sigma. However, this was after being 3 years in pick up, and practicing this stuff seriously.
3) A third option is going for clubs (if they all 18 year old in clubs where you live) or get a fake ID (it is risky). I went for the latter. Hence, why I kind of stopped gradually caring about high school status since I didn't need it, I would just go to a club, do a cold approach and pull. Took a bit of time to get used to, but the idea of going to a club empty handed and just pull something always intrigued me.
So once I got access to clubs, I kind of care less about high school status, which was very liberating considering it is a lot of work. It also allowed me to concentrate more on school, which led to better grades. My motto became "shool is for grades" and "field is for pussy". i kind of kept this philosophy since then. I broke my rule a few years ago when I screwed girls from my class - but I can break rules, since I am a veteran in this field.
The advice you got from others here are indeed interesting, but keep in mind that few of the posters here have actually been reading and practicing pick up at 17 - and done so succesfull.
I was a successful PUA at 17 (was part of the masterminds forum at age 18).
i started out at 15 - 2007.
Best,
Alek