I am sorry that no-one answered your last question. I guess they might have found it too difficult - as I have found. If you want to be " a graduate officer", you are at least 8 years away from your goal, and many things can happen along the way.
The best task for you now, is to pass your GCSEs to a good standard. I suggest 5 good A or B grades minimum. Join your local ACF unit, if you have one. If not, try the RAF, Naval or Boy Scouts. All will give you the necessary background in thinking for yourself and understanding that a life in uniform is about other people.
Then A Levels, again to a good standard, and then a good degree from a good university, by which time you might also have joined the UOTC or the TA. RCB (in old money) and Sandhurst will then be a doddle!
14 and your life's mapped out. That is genuinely impressive. Let us know how it all turns out.
I'm glad I didnt know what I wanted to do with my life when I was 14. Some of the most interesting people I know are well over 30 and still don't know what they want to do with their lives. Me, I'm not sure what I'll be doing next week or where I'll be, let alone in 8 years time.
The reason you have probably not had much of a response is that your questions have been asked and answered dozens of times before. There are several threads and stickies on this subject in the Officers board. Read them and most of your questions will be answered.