Minor. Unpaid tickets. Can I challenge a ticket?

You need to contact the court right away. The fact that you missed the court dates may cost you more because of fines. It may also mean that you waived your right to challenge them. If you can get a court date you should bring in your attendance records over the past year. If you have not had any more marks on your attendance the court may be willing to dismiss the truancy. Next time make sure you either pay the fine or go to court.