Here’s a simplified and polite version of your email that clearly conveys your concern:

Subject: Concern About Mandatory Salesforce Certification

Dear Sir,

I hope you are doing well.

I am writing to share a concern regarding the mandatory Salesforce certification being asked of all students. Many of us feel that this certification is not useful for our studies or placements, especially since it is not related to our field.

The certification takes 2–3 days to complete and uses up our valuable time. If it was important for placements, it would make sense, but even students who are not part of the placement process are being forced to do it. We have also received blocked emails asking us to complete it, which feels unfair and unnecessary.

We kindly request you to please look into this matter. It would be better if this certification was optional or treated as an assignment, not compulsory for everyone.

Thank you for your understanding and support.

Sincerely,
[Your Full Name]
[Your Roll Number]
[Your Department and Year]