I used Easy as 1 2 3 from CHC last year with my first grader and we really enjoyed it. It is more of a guide than anything else. It gives topics and a suggested depth to cover for 1st, 2nd and 3rd grades. It give some ideas for activities and (my favorite) it adds a section on our faith at the end of each unit. They tell which stories to read along with in CHCs Catholic Stories from Science 2…but we didn’t have that book this year. We just went to the library and found books on the topics suggested.