Seriously study the basic elementary functions in high school textbooks, and be familiar with their basic properties and applications (the junior high school foundation is very good, and some people guide you. If you have a little talent in mathematics, you will get something if you continue to study intensively for half a year), so that you can get rid of the embarrassment of reading gobbledygook while watching advanced mathematics. Then consolidate the foundation while studying, plus the patient guidance and continuous efforts of others. After 1 year of study, it is no problem to get more than 60 points. Getting a higher score depends on your talent and your efforts.
To tell the truth, normal people rarely have the perseverance to complete this year and a half of mathematics life. I sincerely wish you success!