Hi. I'm so glad I've discovered this forum because I've been looking for something like this for years. Just by searching through old posts, I've found the titles for two movies -
The Peanut Butter Solution and
Monster Squad - that have been pestering me for years.

But I still need help with at least one title. I can't remember whether the characters of this American 80's movie were in high school or college, but they were definitely school-age, and they were grouped according to various stereotypes, i.e. nerds, jocks, etc. I can't remember what they were competing for, but I know all the groups were color-coded (I think the nerds wore white), and one of the obstacles involved a golf course. Also, a van played an important part for one of the groups; I think the nerds were using it to store all their computer equipment. The final scenes take place in a hotel, possibly involving an escalator.
I'm sorry this sounds so vague, but you know how it is: if I remembered anything else, I probably could have found it on my own!