Yes and No. Depends on how your child is doing.
If your child is intelligent, able to understand the subject and does not practice because he is lazy, then the problem is not subject knowledge, it is laziness. You can easily help him by working with him.
On the other hand, if your child is unable to follow what was taught in school and lacks behind then he needs tuition.
Education and learning follow scaffolding. If his fundamentals are weak, he will not be able to do practice question or learn advanced concepts. When things become more and more difficult for him, he may become not interested in the subject.
Academic help in earlier years is more effective than getting tuition for your child only at important stages (like PSLE or O level).
Regular communication with your child is really important. Talk to your child and find out whether he needs help.
If you know the subject well, you can tutor your child or else you need to hire a qualified tutor.
Besides an expert in the subject matter, the tutor must be well experienced in teaching the subject effectively to students. The tutor must be aware of the learning difficulties that current students are facing and ways to overcome them.
