Regarding exam application

Respected Sir/Madam,
Sir/Madam a mistake was made in online exam appication filling,
I was cleared my first group and I applied for second group exams this time,
I mistakenly forgotten to enter first group passing details..
can I attach that details in letter in written..?
can u tell me solution sir,i am afraid of that sir...
Please give me reply as early as possible sir..
Thanking you sir/Madam..
Mohan krishna.Ch