Physical activity is not only important for your child's health - it will help them cope with the sheer physicality of interacting with twenty children on the playground. Bumps and shoves are inevitable, so make sure your child has lots of physical play to develop gross motor skills too.
A step-by-step set of preschool worksheets will introduce new challenges to your child - skills and concepts they have not yet learnt. With your support and encouragement, your child will learn these new skills, achieve their goals, and gain confidence that will be vital when they start kindergarten or school. Starting 'big school' brings a lot of changes into a child's life, and your child needs to believe that he or she can face new challenges and cope well.
Since 3rd grade math relies on the concepts that were learned during kindergarten, first and second grades, don't be afraid to start your child at a lower level.
Ideally, children who have been introduced to reading modeling behavior enter kindergarten and first grade ready and eager to read on their own. For most children, the formal teaching of reading begins in these grades. Most educators, homeschool or otherwise, use a combination of phonics programs, worksheets, and actual books to teach reading. These are all tried and true methods and can result in reading success. A relatively new methodology, syllabics, extends the focus of phonics programs on the sounds associated with the consonant letters to simple rules for correctly using the variable sounds associated with the vowels.