There are plenty of options available for you after your 12th standard if you're a PCM student, science isn't all about engineering you see so first of all I am telling you about some of them in brief.

• BSc - You could do your granduation by doing BSc in either of the subjects like physics , chemistry mathematics and after that you can even go for your post granduation in the same that is MSc and condsier PHD in any particular subject if you want. 
• Bank- You can even give a try to it too, as bank only demands a graduation degree so after doing BSc/B.com you may consider it as it a field with growing opportunities all you need is to clear it's enterence exam which will not be very difficult if you are from maths background.
• Teaching- You may also consider teaching after completing your graduation and with PHD you'll able to get a job in government colleges as a professor. 
• Architecture- You may also go for architecture if you're interested in designing. 
• NDA- I don't think I need to tell about it's advantages to you so , clear it's enterence and you're good to go.
• Media & Communication - You may also consider mass communication as it is also a growing industry in today's time with a lots of opportunities and with less competition obviously.
• BCA- Bachelor of Computer application as the course says you'll learn about coding, softwares and much more things related to computer in this course.

But in the end it all depends upon your personal interest so explore yourself as look in what field you're interested and go with your call.

Good luck!! 

Hi,
There are huge options.
* Pursue CA/CS take up BCom
* Pursue Arts take up BA & eventually write competetive exams like PSC,Banking etc.
* BA in psychology/Law /Journalism
* Take up Mass communication
* My suggestion would be not take up BBM/BBA (Not all colleges have a recognised AICTE course for this)
* Pursue interior or fashion designing.
* You can take up BCom/BSc/B.E & later take up MBA (HR/Finance/Operations basis your interest)
So options are many it depends on your interest area.
Goodluck
Thank you :)