If there are 3 right options and you mark 2 or 4 options then you will get -1.
You have to mark only the 3 correct answers to get 1 mark
You can also have a question wherein all the 5 options are correct (if you mark 4 correct options you will get minus 1)
If there are no right answers and if you mark anything then you will get - 1 again
So you have to be very careful while attempting this paper