What song is this??????????

it's definitely not a new song because i remember listening to it when i was 4 ish years old (i'm 15 now) and i only remember a few snippets of lyrics : "sunny days oh yeah" "when i think back to all the crap i learned in high school" or something along the lines of that... i cant remember anything else but i really want to here this song. If it helps i remembered those little parts when i was listening to the song " have you ever seen the rain" by creedence clearwater revival, even though it sounds nothing like it