See if you have submitted your copy succesfully then you have nothing to worry about. The option for invigilators signature is provided in order to be sure if any problem occurs then the student can prove his/her presence and he/she have given the examination. So there is nothing to get freaked out. Everything will be well.

To know more about KCET visit the link below:

https://www.careers360.com/exams/kcet

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