It is best to send all your scores as long as none of them are outliers. Slight differences are normal and can help the admissions committee understand your performance. If you took the exams multiple times (beyond the normal two or three), it is best to just send a couple of your top tests and not all of them. The questions to ask are does this add any information that other parts of my application do not and am I fulfilling all the requirements.
These are some programs that are popular among high school students. This is by no means an exhaustive list of nationally recognized programs. Boy’s/Girls States