Can someone guide me about a tech career which does involve extreme maths(like ml,ai,ds) or JavaScript/css?

Theoretical physics.

Does not, but is the definition of extreme maths.

From most to least glamorous, given their current trendiness:

Infosec*
Sysadmin*
Backend developer (any)
DevOps* (any)
QA/Tester
Server engineer (any)
Database admin (any)
Network admin*
Domain admin
Helpdesk
IT support

* subnetting requires elementary-level math, plus base conversions.

So... basically any position except a) frontend developer, b) full stack developer, c) ML/AI/Blockchain/Cryptography developer/engineer, d) academia wannabe-developer.

Hope that clears some things up.

Why do I feel like there's a "not" missing from the op's question?

@nibor DAMN YES!!
That's probably why i have to stay away from maths, thanks @root for *missing* the mistake and answering what i wanted to know

@Root which of these fields have companies that would take freshers and train them under associate or trainee profile?

@StopWastingTime 😊

To your followup question: any, depending on luck and merit. I'd suggest seeking whichever you find the most appealing, not the first opening. Don't let people get in your way.

@StopWastingTime haha I was dying to know how these were your two options.

"I'd like to succeed in either theoretical physics or plastic surgery"