Is it good to stay in tcs with 30 LPA with C3A designation, getting un allocated on Monday

I would say not good. Either C3A or C3B with a high salary coming to the bench is not good.

tech stack / unit?

Nikallo bhai yaha se asap

Maje he bhai tere to

My friend had 31 and got a project not that negative for java aws

Nopes, not good,

Yes good