There is no harm if you are not able to complete all eight books.  You can consider different plans when making your choices:

Allow your student to choose a topic according to an area of special interest. Students love the power to make choices and take ownership.  Their curiosity will keep them engaged, and they’ll enjoy the journey all the more. 

Fill in possible gap areas. If you see a few subject areas your student has not had the opportunity to explore in depth before, here’s the chance to fill in those areas and round out his or her science background. 

Double up to get through more books. Our books are designed to last a whole school year, spending time in science two days a week. Each book has 14 lessons. Spending two weeks on each lesson will provide 28 weeks of science, leaving room in your schedule for field trips, science fair projects, and flexibility to accommodate individual family needs.  When a family doubles up science plans to four times a week, a book can easily be completed each semester. In climates with four seasons, Botany can be a fun course to take during the summer months when families are often busy with gardening and landscaping projects.