What happens if we fill wrong percentage details in CAT 2018 form by mistake and the correction window won't open?
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You cant change those mistakes and that options cant be edited.You have to enroll a new one.But if wont cause any problem as many students do these mistake which later you can rectify.
I hope this helps.

CAT 2025: VARC, DILR, and Quant MCQs & Weightages
Comprehensive CAT prep guide with focused practice on Verbal Ability, Data Interpretation & Logical Reasoning, and Quantitative Aptitude.