Hi there, you're in the same boat as me. I'm 15 years of age. I have my Standard Grade results from school (very happy) and i'm now doing my highers in maths, english, physics and geography. I have flown 2 hours in a Cessna 152 and have 7 landings/take-offs to my name!
I'm not considering a PPL as if you're doing an intergrated course then what's that point and also, if you're trying to get at 17 goodluck with your studies of flying and school rolled into one. It's very, very possible that you could have done better if you do each one seperate. I'm concentrating fully on high school just now then get a job after my highers (need time to myself, a lot of study during and after school) so i don't have a job just now.
I'm doing it in blocks. Accomplish school first getting the best possible grades, get a job to earn some cash and build a more mature attitude and more worldly knowledge and then begin to consider and Intergrated fATPL course.
NB - that's if everything goes to plan!