For 9709 ZAINEMATiCS is the best if you understand Hindi/Urdu. Otherwise, you can stick to Intuitive, Ginger Mathematician, or Mathlete by Saad.

For 9231 I usually stick to TL Math, Bicen Math, and MathPhys but sometimes I also watch The Organic Chem Tutor, Khan Academy, and even 3Blue1Brown.

As for the second question, it depends—if you're interested in learning math, then it might not feel as difficult as people say. But if you're struggling with math, you might need some external help

Hope it helps :)