How can I convince my parents to letting me buy my own Laptop?

Perhaps they see you as the responsible one and feel like you should bare with it. Any how you should explain it to them or just buy it. Approach them when they are in a good mood and are happy with something you are doing, try to work a little hard around the house and school to improve your reputation and atleast give them small signals that it is getting unbearable (do not make it obvious you want a new computer).

Although, they might only be looking to help you use that money more wisely, the economy is getting tough and will get only tougher. So think rationally here and for my sake ignore the other guy giving you strategies; they might be taken as rude or offensive; it will ruin your chances of getting a new computer. Can you bare with it a little longer?

Or am I completely wrong?

You can buy it use your own money without their permmision cos you are 16.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.