Yes, you can fill the CAT form even if you currently have a backlog. CAT eligibility requires you to be in your final year of graduation or already graduated backlogs don’t stop you from applying.

While filling the form:

• Enter the aggregate percentage/CGPA of marks you have obtained up to the latest semester for which results are declared (in your case till 4th semester).

• There will be an option to mention that you have a backlog.

• If you clear the backlog later, you’ll just need to show the updated marks during admission.