Hi siroccoon, Nothing is hard and easy.
Actually, CELPIP doesn't have enough materials for preparation. In fact, specially in speaking modules they have some questions where we need to listen carefully otherwise you can't give proper answer. As a result, It will affect on scores end of the day.
Whatever they mentioned online materials and sample test it is very easy whereas in actual exam it has been realized very difficulty in speaking modules specially.
It is very difficult to achieve 4L in each category. Because at least in IELTS we have enough materials through online so t we can achieve desired band ( Minimum 6 Band ).
Before taking CELPIP exam, kindly practice speaking modules it is very difficult compare to IELTS.