Hello aspirant,
You can attend NATA exam for second time, as there is no issues in taking exams after an year but if you take again it completely depends on your scores which you take in your next attempt. So try to score still more better marks then your first attempt and get better college.
Below link helps you to know about NATA related information,
https://engineering.careers360.com/exams/nata
Best of luck
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