I can not understand quantitative at all, please suggest textbooks to study first

I tried several times to read and reread the quantitative curriculum several times but really do not understand it at all.
The last time I open any mathematics or statistics book was in high school.
All I need is just one textbook or more to study the principles, fundamentals, basics, and foundations of statistics and quantitative, then I will start to study the quantitative curriculum.
I did search on the forum first before posting this thread and found this thread but it does not include an answer to my inquiry.
https : // www . analystforum . com / t / 71352
(Please remove space in URL)
I hope you may help me.