If you want to go with one of the most tried-and-tested ideas for a school fundraiser, it doesn't get much better than chocolate. Yes, you have probably seen this school fundraiser done a million times before, but think about why that is - it's because chocolate never goes out of style, and these sort of ideas for a school fundraiser return fantastic levels of profit no matter how many times you try them. This is an especially potent idea for a school fundraiser if you can get permission from the school for the kids to sell during lunch periods and after classes on school grounds.
On the other hand there are plenty of other ideas for a school fundraiser that don't involve candy. For example, our school scratch card fundraisers are not only very popular, they return some of the highest rates of profit of any of our ideas for a school fundraiser - up to 90% if the school can commit to at least 1,000 cards. That is some serious fundraising potential there, and as far as ideas for a school fundraiser go, you could certainly have a lot of success with something like that.