There are 2 main reasons why kids may require tuition.
The first is known as ‘Foundation Tutoring’, where children are unable to keep up in class or are falling behind so much that they're losing interest in the subject altogether.
In this case, tuition is necessary to help your child get back on track, so find a qualified tutor who will be able to inspire your child to learn to love the subject.
He/she must also have the strategies that will help your child catch up quickly.
The second reason is that your child may not be fulfilling her highest potential and may need extra coaching a few months before a major exam to boost her scores.
The goal of the tutor here will be to help your child consolidate her knowledge and answer any questions she may come across when doing practice papers.
Ultimately, remember that one of your goals should be that your child won't need tutoring help in the future, so work with the tutor to inculcate independence and self-study skills.