Well every kid is different obviously, but that's one of the traits that is common in kids with Autism...a very focused interest in one or two things. They can tell you about that thing in detail and might not notice your eyes glaze over when they are talking about something you have no understanding of. I don't play chess and don't really understand it, but A will tell me in detail every move he made in a particular match and how his opponent responded, and why his moves worked or didn't. I just nod and tell him "well done!".
I can understand wanting to have more fun. When I was in school, my mom was very strict and I was in trouble if I even got an A-, so I always felt really pressured and I was a wreck on report card day until I could see if I managed to keep my grades up. My brother never had to crack open a book and got straight A's so my mom expected me to get those grades, too, but I am not the natural scholar he is. I managed, but there wasn't much time for fun. My life revolved around school and extra-curriculars. I was on the student council, in speech and debate, national honor society, I did all the plays and musicals, international club, and I did cheerleading in junior high and my freshman year, but quit after that because it got really catty when this one girl joined the squad. But most days I left for school early to get help with math and then I'd be at the school until 8 or 9 for play practice and student council, etc. I don't want my kids to be as stressed out as I was. I want them to be involved, and I want them to do their best, but if they have to lock themselves in their rooms until 11pm to get their homework done, that's too much. I was spread so thin, I was transparent, and part of that was because if I wasn't at a school activity, I had to be home before it got dark, which in the winter was 5pm. I wasn't allowed to date or wear makeup, so my social interaction was pretty much limited to speech and debate trips. I really didn't fit in with my classmates anyway, so instead of going out to party with the rest of them, I was at play practice, or doing homework, or at speech and debate tournaments. I'm a nerd by necessity. But I don't want it to be that way for my kids. I want them to have more balance.