In a couple of paperbacks, with the title Young Adults, (Tor Books), you will find Dead-End Dada, and The Dada Boys in Collitch. If you find it, that is. I see you mention Martwist College--so you do have the expanded Young Adults. No more sequels after that, except for the reader-written chapters of the Kevin Shapiro story which appear here and there on the net. Meanwhile, still available in hardcover, and soon in paperback from Houghton Mifflin is The Education of Robert Nifkin, which is not quite the same thing, but you may like it.