[trufan]

Most single A schools are around the 300 (or lower) mark of students in grade 9 thru 12.

According to the information that Touchstone Energy has put out for the qualifications of the All "A" tournament is,

Class “A” schools are those with an enrollment of 425 or less, in grades 10 through 12.

Every school that is participating has less than 425 students in grades 10-12, so to answer your other question, will an actual "A" school win the tournament, yes, according to the criteria of the sponsors of the tournament, just like before.