Hello,

No you will be not allowed and will get rejected then and there. It is mandatory to show 10th  and 12th original certificates. There will not consider your any excuses even you try to say whatever you have in your reason part.

You have to show your original 10th and 12th certificates and other documents too. If there is any thing which gets missed then your application will get rejected. This thing is not a thing to be done carelessly. You have to be cautious and attentive.

Get your original documents while counselling or at any phase where you have to show your documents else you will get rejected.

Hope it helps!