Working professional, need advice from the community

Hello!

I am 22 M, recently employed as an R&D Design and Analysis Engineer at a firm. I want to start prep for CAT, planning to attempt it as a trial in 2026, and full fledged in 2027.

Could y'all please recommend me some good YouTube channels for starting? I have with me some TIME course books for practice, and just need some extra things to practice and strengthen my understanding.

Thank you!