tablets aren't going to be ideal for schoolwork as you describe. Tablets are much more oriented towards content consumption than creation. If you need to type papers etc, get a laptop. you can even get laptops cheaper than a tablet anyway.
And for those that say you can get a keyboard addon for a tablet, its still running android (which has no real office suite) and that can cause all kinds of complications if you need to open/save/print/send office documents in school.
Try looking for a cheap refurbished or used laptop to hold you over, and start saving for a tablet.
you can get a cheap new laptop for $350-450, like this: http://www.toshibadirect.com/td/b2c/cdetland.to?poid=509558