I am delighted you are so keen to learn to fly and wish you all the best. May I just ask one small question? Are you only just 14 or nearly 15? The reason I ask this is because I have a nasty feeling the validity of your written exams could expire before you can legally have your PPL. As far as I know they are only valid up to two years before they have to be retaken if you have not gained your PPL by then. As you can't have your licence until your 17th birthday this is a bit of a worry. Please check carefully with your FI as I would hate you to have to spend more money (and take more of those exams) than necessary.
There was a thread recently about the
Air Training Corps where many people told of their experiences, do have a look at it. If you decide to go to University then DO join the UAS (University Air Squadron)