I can give you a list of popular YouTube channels that were well-regarded for competitive exam preparation at that time.

the popularity and effectiveness of YouTube channels can change over time, so it's a good idea to research the current status and reviews before making a decision. the popularity and effectiveness of YouTube channels can change over time, so it's a good idea to research the current status and reviews before making a decision.

Here are some YouTube channels that were known for competitive exam preparation

Unacademy

Adda247

Study IQ Education

Byju's Exam Preparation

Gradeup

EduTap

wifistudy

TopRanker

Mahendra Guru

Testbook