you should have clarified your question..
but to clear a liitle of your doubt.
credit system in cusat states that you should have a minimum of 45 credits till semester 3rd to get admitted to semester 5,
and you secure the maximum credits assigned per subjectif you get a pass in that subject.
as such 1st year has got a total of 45 credits, and third semester onwards we have 22 credits per semester.