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My question is can someone who is not well educated (secondary school graduate) understand the statistics of bitcoin investment or Bitcoin trading?
Bitcoin trading or investing is not based on how well your education is, even old people with their bachelor's degrees can't compare to those who trading bitcoin for years. If you want to learn about BItcoin it's better to start now and learn something small day by day along with your native education.
Trading is a skill that you can learn on the internet, as we can find tutorials online. There is no need to get into school, no matter how old you are, and all you need is determination and effort to get those. Though others will try to go to school to learn more as there are sometimes tutorials online that are too broad, they will try to learn more in school, but others also are going to have experience to help them learn more.