The marks required for getting admission change every year as the level of difficulty also changes each year.
According to some of my friends studying there, CLAT sets a tough paper one year and an easy paper the next year and vice versa. However, this should not be taken for granted.
Do not think of a particular score while attempting CLAT as this will hamper your chances. You should aim to give your best and attempt any number of questions you think are possible on your part.