I’ve written about the free k-12 curriculum from MS Nucleus.org on my main TJ site’s science page.
You will find teacher’s guides and student workbooks there (www.msnucleus.org) in PDF format or in web page view.
The only drawback really is that for some of the experiments, you will need equipment. You can purchase it from the site or I guess collect/buy the materials elsewhere. What I really like is the student reading pages and workbooks because generally we don’t do experiments unless I have the stuff on hand.
For quick reference, here are the links to all the K-6 printable teacher guides and student workbooks:(PDF)
Applied Science: http://www.msnucleus.org/membership/html/k-6/as/aspdf.html
Universe Cycle: http://www.msnucleus.org/membership/html/k-6/uc/ucpdf.html
Plate tectonic cycle: http://www.msnucleus.org/membership/html/k-6/pt/ptpdf.html
They are resources for above 6th grade as well, so I recommend looking there, as there are printables as well, however not all are complete, they mention that they are in progress. I did download some of the teacher guides and they have student reading material in them, experiments, etc. Its a little more detailed to go through those so I won’t list those here, but once you click on the particular area, then click on a subject area in the grid, then on the bottom you will see a teacher’s corner. This is where the teacher’s guides are. They even include review tests. The elementary levels have model tests.
Secondary grades: http://www.msnucleus.org/membership/jh.html