Oh I am so sorry, but I am glad you want to continue, there is age for education.



There is just one problem that your 12th marksheet is valid for only 3-4 years maximum and as u gave your exam in class 12 so the time has been over now,



Neverthless there are few courses like CFA,design etc which may help you out.



If you have determination you can do anything, you can even start something of your own like a business or something.