Not having your 12th standard marks listed on your resume may result in missing out on some companies that have a graduation/12th standard percentage as part of their screening criteria. However, there are not many companies that consider this as a criterion.

Not having your 12th standard marks listed on your resume will not render you jobless.

A requirement for past academic records is only used for initial screening purposes by some companies. The companies that move forward with you for subsequent rounds of evaluations, such as group discussions and personal interviews, evaluate you based on your performance in these rounds.

It is important to note that if a company does not choose you, despite your excellent performance in the interviews, simply because of your previous academic records, it is the company that misses out, not you.