Paper rounds, chat to your local News Agent
My first question to is why so desperate to find money at this age? Why not talk to your parents or guidance to see if they can't help you with the extra money you need. When looking for any job at your age you might need an adult to represent you since the world is not what it seam to be from the way you think. There are possibilities that you might end up in the hands of bad people who will promise to get you work at the end turn to abuse you. Or initiate you into some sort of bad activities or a cult.
I advise you to seek help from a close family member or a friend's parent (you really trust) in searching for any job at your age. Baby sitting might be a good job for you since I believe you will also need to do your school work while doing this work. You can learn web design vist www.joomla.org and start designing and hosting websites for your friends at schools (if you are really positive about this and if you enjoy designing).
Hiyah
My daughter has just turned 15 and she needed to raise money for a school trip so this is how she did it:
Car wash with friends, 4 of them every Saturday went round with a bucket sponge and polish, started with one car £5 and worked their way round the estate. Amazing how many people want their car washed but don't get round to it.
Then she went to the pound shop and stocked up on loads of multipacks of food, such as crisps etc. She put a few in her bag and sold them at school for a modest profit. People soon knew who to come to for a packet of polos or some rolos. Its the holidays coming up so seek out the local park and just let your friends know. Don't sell to strangers and always take a friend with you.
Hot days I went with her and we sold ice cold coke from a chilly bin (camping cooler box) we went ot a park full of mums and kids near a paddling pool.
We went through her wardrobe and she put some items on ebay which she sold and had to send off herself. She got £10 for a couple of tops which was great.
We went then to jumble sales which we found out about from the local paper. We bought clothes massive bag fulls for £1 and £2 a bag then took them home and washed everything and had to mend and repair things. This we put on ebay and did really well. One pair of jeans we bought for 20p went for £22 plus postage, but other things did not sell at all.
Stick to brands like Next and Monsoon and people will buy from ebay.
Good luck
Find out what people want and provide it at a profit Either sell your services (car washing bysiing etc or buy and sell goods
Buy goods from e-bay and sell it to them for more than you paid for it
what ideas can you think of anyone in the breightment area if your looking at this please comment need some money :)