The first is for all teachers: http://www.readworks.org/
here) if you need to convert it to the leveled system that your school uses. Once you have determined the level that you want, you can see reading passages and questions for a given skill that you are working on. Or, you can choose the skill you are working on and find passages at various levels so that you can find something for your entire class! There are both fiction and non-fiction sets available, including some that you could use to enhance your science/social studies instruction. Plus, students could take them home to practice their reading skills there as well!
The second site is a resource for multi-grade teachers but could be of use to single grade teachers as well: http://educationnorthwest.org/resource/1680
Here is some information from the site:
“The Multigrade Classroom” is a seven-book series that provides an overview of research on multigrade instruction, identifies key issues teachers face in a multigrade setting, and offers resources for multigrade teachers. Produced in 1999 under the Rural Education Program to address multigrade teacher training in rural areas, the handbooks are also applicable to schools in other settings and are among the few practical resources available on the topic. The books define multigrade instruction as grouping children of two or more grade spans with diverse ability levels into a single classroom where they “are encouraged to share experiences involving intellectual, academic, and social skills.”
-Review of the Research on Multigrade Instruction
-Classroom Management and Discipline
-Instructional Organization, Curriculum, and Evaluation
-Instructional Delivery and Grouping
-Self Directed Learning
-Planning and Using Peer Tutoring
I hope that one or both of these resources will be helpful to you!