The hell no. As DevX101 said, children don't understand why they need to get an education in the first place. This creates the impression that going to school is a job when it most certainly is not. There is a difference between offering an occasional prize (a toy, lunch, or event) because a kid did well, and making them believe they are entitled to get paid because of their performance in school. There's also the fact that I believe it can hinder the natural curiosity a kid may have by introducing a mitigating factor in the process of choosing his/her interests. Lastly there's the fact that some kids are - sadly - complete imbeciles. Are this kid's not going to get payed because they did badly, even though they might have even tried a whole lot harder than the other kids?

I say, let the smart kids be smart, let the dumb kids be dumb, let the in between's be regular children. Hell imagine every kid becomes a "smart" kid because of payment; can you imagine the surplus of people in comparison to employment opportunities in the "brainy" work sectors?