Honestly there really is no way to get 10K or even 5K by next summer unless you can find a really good paying job and have 0 expenses. You can try to get a loan but you would need a cosigner (I could be wrong on if you can even apply)
Now I know you didn't ask for this is your post but I am going to touch on it anyways.
Do you really want to spend 10K just to get your PPL? With 70 hours you are talking 142.85 an hour on average. I pay about 110 with instructor and fuel in a 152 for mine. This price seems way high although I don't know the flight school. You can try to volunteer around the flight school and they might give you a discount pretty much work in trade for flight time but I don't know if this will be much of an option (I don't know min age for work where you are) What type of aircraft will you fly? Do you have to pay for fuel? Part 141 or Part 61? Have you looked at all the flight schools in the area even if you have to travel a little?
I would have to say think really hard and make sure it's the flight instructors you like and maybe not the prestige about the school. What is it about the other schools you don't like?