As a student, please do observe your children behaviour and mental health. Sometimes a small change can lead to a bigger catastrophe. About preparation for secondary, I advise that they learn a topic before the next class, following their timetable. Consistency is key. Do not expect a high score at the start and if they fail instead of saying "why?", it's better to say "is there something you don't understand that we need to pay attention?" Show that you care for them, not their grades. Goodluck