It is difficult to clear NDA's General aptitude test without studying Social Science. Only if you are able to answer all questions other than S. Science related questions correctly, then you might clear the test, for that you need to be very accurate in your answers.
In SSB round, Social Science would not matter as it is a round based on your speaking, writing and mental ability skills. For that you must practice some speaking and writing test with good grasp on analytical thinking.
Good luck!