Hi Joyce, first I'd check with the Oregon Genealogical Society & Research Library, www.rootsweb.com/~orlncogs/ogsinfo.htm. They are located in Eugene. They might have more than school records on your grandfather.
Do a web search for Oregon State Archives and their web site will appear. I think I remember seeing school records there but I don't remember if you need a volunteer/researcher to physically go to an address to copy them or not. Successful Hunting!