see the chances for your cs seat in the spot are good and you might get thatt there
but that is not for sure and whether you are going to take that risk or not is your decision
if you are seeking for advice then i would say that you should join in IT thinking that you would get that in the spots but even if you miss that there then also there are chances that you can change your branch next year if there are vacancies and favourable rush for you but you know i cant say much as it is your decision whether you are comfortable with IT or not.
but even if you miss at both the stages and end up with IT then also it is not a bad branch
but ya if you have better options anywhere else then you can go with that too it is your decision
best of luck