In my experience, math was the easiest portion. I was expecting it to be super difficult and complex but I got a 98 in the section from just going through the book called ATI TEAS 6 Smart Edition (I’ll link it). I supplemented with other materials for the other sections but only used this book for math. https://www.amazon.com/ATI-TEAS-Full-Study-Guide/dp/1949147452/ref=mp_s_a_1_11?dchild=1&keywords=ati+teas+book+prep&qid=1599713960&sr=8-11