Hello,
You haven't mentioned the exam or application you are enquiring about. If your query is about JEE Main Admit Card Declaration form for non-aadhaar candidates then you have to fill it and carry it to the examination center. You can fill it in capital letters or small letters (sentence case). But we would recommend you to write in capital letters as it will avoid confusion. So fill the declaration form in capital letters. You need to carry the following items inside the examination hall
You may read the exam day guidelines and instructions by clicking on the link below
https://engineering.careers360.com/articles/jee-main-exam-day-guidelines
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