If you have missed your VITEEE online examination through Proctored Mode then I would recommend you to contact the authority as soon as possible with a elaborative plea to allow you again for the examination. You should keep all the information in the application.

Contact details for Admission office:

Admissions Office
Dr.G.Kalaichelvan
Director - UG Admissions
Vellore Institute of Technology
Vellore - 632 014,
Tamil Nadu, India.
Phone: + 91-416-220 2020
Fax: +91-416-224 5544, 224 0411
Email: ugadmission@vit.ac.in (mailto:ugadmission@vit.ac.in)

To know more you may visit the official website:

https://vit.ac.in/contactus

I hope my answer helps. All the very best for your future endeavors!