If you don’t get a Maths tutor to help your child then you’ll have to rely on someone else who might not have the expertise of an experienced Maths tutor.
Worrying about not doing well or even failing doesn’t really do you any good. It only uses up energy that could be used for somethings more positive.
The way to practice Maths for exams is right at the start of the year by doing the questions in each exercise thoroughly the first time.
The best way to study for Maths Methods exams is to work through questions at a pace where you can make sure you’re getting the right answer.