We started homeschooling our DD8 because we thought she might be bored this year. We just started her on Singapore 4A after speedily going through Singapore 3A/B to make sure you she didn't have any major gaps. There were some effort places but overall she went through it pretty quickly. I decided to order the 3rd grade Abeka speed drills and test book because I think she could use the practice of quickly computing simpler problems. She looked at the final exam and said "Mom, I know how to do all of this already. Easy Peasy."