Coursera has some free statistics courses as well. They’re fast paced and skip over some stuff but it can help guide them with side research. I have the Humongous Book of Statistics: https://www.amazon.com/Humongous-Book-Statistics-Problems-Books/dp/1592578659/ref=mp_s_a_1_16?crid=2CW6P82RP6I7O&keywords=statistics+practice+workbook&qid=1652071796&sprefix=statistics+practice%2Caps%2C140&sr=8-16 Having a paper copy is helpful.
I also got a coursehero subscription which can be cheating and some info can be wrong but I found it helpful just looking over different students’ methods and conclusions.
Also recommend Khan Academy. And any free textbook on Bookdown.
The Humongous Book of Statistics Problems: Translated for People Who Don't Speak Math
http://www.amazon.com/The-Humongous-Book-Statistics-Problems/dp/1592578659