Best teacher for UPSC

I want to know if these teachers are good enough for prelims and mains, and reliable to follow with standard sources:

Polity: Jatin Gupta sir(vision)

Geography: Sk Menocha + Md Rizwan + Shiv Arpit (vajiram and ravi)

AMAC: Praveen dixit sir (vajiram)

Modern history: Himashu Khatri sir (vision)

Society: Smriti Shah Mam (vision)

Ethics/Essay/ Economy: yet to decide(kindly suggest)

Please tell me if these teachers are good or not. Suggest better alternatives if any.