Can I wish I did better in school?
Of course you can but why do you think you didn't do well in school?
I wasn't smart enough to learn to read well and math was so hard for me. It took me a long time before I got used to school.
Schools can be difficult for some people and it is good that you recognize where things went wrong. It helps you improve and become a better person.
Is there a way to learn how to read and math quickly since school is going to start soon?
I think you're mature and trying to fix something that you know you can do better at. That self realization is commendable. You should try looking on YouTube for videos that can help you learn faster.