This is great! Simple, to the point, and love the mosaic the design creates. Please keep #25 as a final idea---it's definitely our favorite. Could you try three of the students instead of four to see how that looks and maybe do some spin-offs of that logo as well? The type is strong but maybe we can try a few other typefaces? Definitely love the san-serif fonts. The kerning on the words "learning center" seems a bit clunky and not spaced so well. Let's work on refining this one and see where it goes! Great work.
#4 looks great. I spoke with the client and they said we have to avoid both blue and red because these are gang colors. So can you try other colors---a green version, orange version, etc. . .