I made a big mistake in cuet form

So I was going to give NIOS this year in april , but my first exam went really bad so i dropped the idea as my main was to get 75% to qualify for jee and bitsat but that was not possible with the prep i had, so actually while filling cuet form i filled that i am a 12 appearing candidate, but now i won't be having a nios marksheet so i want to use my old cbse marksheet, if i put that makrsheet during counselling will i be in trouble? will they cancel my admission?