Central Seat Allocation Board [Csab] — Csab neut

Sir with due respect I have a question .sir i have given improvement exam in class 12 when i go for the registration for csab neut they told me that they are not going to accept improvement marksheet .they told me that they are going to accept only one marksheet with 5 subject on it.but cbse does not provide single marksheet .cbse told me to submit both marksheet at the time of councelling .am i really not egilible for CSAB NEUT plz help me clearing my doubt sir.