I dunno. Maybe you should think about what the letters mean and decide through ur own judgement instead of personality tests.
1st letter-I for introverted (sees world through ur own perspective, individualistic, spends time w/ self) or E for extroverted (likes attention, goes with crowd more)
2nd letter-S for sensing (likes practical, memory strong in past) or N for intuitive (relies on gut instincts, future oriented)
3rd letter-T for thinking (likes concrete facts) or F for feeling (relates information in terms of how it is perceived through peoples' emotions/needs)
4th letter-J for judging (works hard towards deadlines, plans things in advance) vs P for perceiving (dives into stuff, improvises later, likes flexibility)