I don't know. How did we learn with that Big Chief tablet and a #2 lead pencil? Our crayons were mostly without labels and stored in a coffee can. We all shared them. Some were long, some were short (the red one particularly so). With all of those drawbacks we still learned to read, write, add, subtract, multiply and divide. We learned history, how to sing and how our government was supposed to work. We made glue out of flour and water. We grew a potato in a jar. We learned how a barometer worked with a large pickle jar and a soda bottle. We learned to tell time from a "Be Back at..." cardboard clock.
Our books were 15+ years old, and we rented them for 50/year. They stopped before WWII, but most of us could kind of remember that anyway. Still we managed to learn. Amazing.
Our recess equipment consisted of jump ropes, jacks that we brought from home, baseballs and bats, basket balls and kick balls. The only water fountains and restrooms were in the basement. For air conditioning we opened the windows. All of our schools were close to home so we walked to and from, summer and winter.
Most importantly, we learned to read. Once you can do that you can learn the rest from books, IF the teacher has inspired you. Where are the teachers of my youth who inspired me?