EducationWeb is a free WordPress theme for education related sites. This theme has 2 columns, right sidebar and fixed width. The background of this theme has a blue and at the header you can see school stuff like books, pencils, a globe etc. I would like to recommend this free theme for school project sites. So if you liked it feel free to use it.
Education Web theme has by default pages on primary menu, but this theme support WordPress menu, so you can easy edit them, and can place on same menu pages, categories and other links. Also, this theme has and second menu for categories which are shown by default.