I'm HFA and I can only focus on what interests me. I got through school because I could just read a textbook the night before an exam and ace it, but when I was in actual classes I pretty much just napped. But I was an admin of my school's computer lab and trained students and teachers, ran a BBS and co-sysoped a multi-line chat system, while holding down a part time job etc. So I totally get the inability to focus on things that are uninteresting or seem not to be useful in a contemporary sense. (This is still the case =)
