You can start between 5 and 7 years of old, seeing your child will need science before they move on to biology, physics, and chemistry.
Science homework just speeds up the learning process, but it really depends on your level of self-discipline.
If you what to take your science education to the next level, then teach it, but if you what to really get the best quality of tutoring, then learn from an older tutor with teaching experience.
Just trust the process, all you need to do is be ready to learn. In time both of you will fall into a nice routine.
Physics, Biology, Geography, and Chronology.
Learning science is about being introduced to the world of inquiry and discovery. A tutor will help you build the background you’ll need for biology, geography, and physics.