Hello Gagan!

Sachin Rana's YouTube playlist (62 videos) or NS Sir's organic chemistry on the Mohit Tyagi Channel that you will follow for JEE Advanced depends on your needs and the constraints of time left for the examination.

Sachin Rana's Playlist:

• Familiarity: You've gone through topics such as GOC (General Organic Chemistry) and Isomerism; so, you might have to proceed with his YouTube videos if you feel it saves your precious time.
• Efficiency: If you are comfortable with Sachin Rana's teaching style, sticking to it can enable you to cover up the remaining material quickly and efficiently.

NS Sir's Content:

• Thouroughness and Coverage: NS Sir is very thoughtful in coverage; this could be perfect for JEE Advanced prep but may take longer (potentially up to November to complete).
• The comprehensive approach: If you want to know more, even deeper, you can find that the NS Sir tutor's content may build a stronger base.

Important factors:

• Time: If you do not have much time, you should finish with Sachin Rana.
• Learning style: Take it as you like, about your teaching style, so if you learn well through in-depth material, it is more likely that NS Sir will help you.
• Prep Level: Do you feel comfortable with the basics? If not, then what the NS Sir is saying is going to help you dig into some decent depth.

Anyways, it's about finding the right balance between depth and timeliness. Whichever you do, practice regularly and take mock tests for how much you've improved.

Thankyou!!