Thank you for your question to the forum.
The situation you are describing is not uncommon, particularly with teenagers. The reasons why children don't bolus can be quite varied. Sometimes it is a case of simply forgetting or feeling as though they don't have enough time to do so. Starting secondary school too can be a little overwhelming and often children can let slide some of diabetes care as they try to adjust to a whole new timetable and environment.
It is really important to get support and advice from your diabetes team, who can explore with you some of the barriers that might exist in relation to bolusing for your son.
It is also very important to involve the school as you try to come up with strategies to improve the situation. Support and encouragement from the school is a huge factor that can lead to better outcomes for your son.