Hi
Yeah! You can appear the NET/SLET exams only and only if you are interested in teaching as a profession. Otherwise it does not serve much. Now that you have done your MBA just take a couple days only to think what you actually wanted to do in life. As such you can make a smaller goal and then try to achieve it through your qualification and reach.
You have to start earning and supporting the family. Life is never easy for the ones who graduate but do not earn a penny. The parents may look at you for some help, however your financial status may be. You need to stand on your own feet. So what I suggest you to explore the options through which you can create and goal and reach that one sooner.
Before you appear for the NET I want you to take up teaching in one of the colleges near your place to get the idea about education and teaching.
Best wishes