Hello Aspirant,

If you were interested in polytechnic then you might have taken admission in polytechnic soon after your 10th , but you took B.A that too after 11th and 12th so your two years in between got wasted ,
But see if you are interested in polytechnic then it's never too late for a new beginning ,
But if you are in final or 2nd year of you B.A then complete it first then you can join in polytechnic or other course ,
But if you are in first year of B.A then better you opt for polytechnic because you still have time ,
First and foremost thing is ask yourself why you want to do polytechnic ,
And next thing prepare yourself for any consequence after quitting B.A ,
or try to complete B.A first then go for polytechnic in that mean time of completing polytechnic you can apply for jobs as well ,

I hope the suggestion will be helpful to you ,

Please take a wise decision because every course has been introduced for a purpose so analyze yourself and your goals and go for it ,

All the best !