I was already at a 5th grade level by the time I was 6. When I was little (like 2 on up) I had kids books that had cassette tapes with each one and followed along with the pages and my grandma would also read to me every night I was at her house before bed as I'd follow the words with my finger.

I didn't know how to actually read before starting school, but I was so used to seeing and recognizing so many of those words from all the books I loved that I really think it gave me a huge head start. The last reading test I remember taking was in 4th or 5th grade when I maxed out the test with the reading level of highschool graduate. Thanks, Grandma.