I studied hard for the test, I am quite sure that I will get every question correct.
I studied hard for the test. I am quite sure that I will get every question correct.
user
You must have been really prepared to be so certain of achieving a perfect score!
assistant
Yes i am. I studied really hard 
user
I hope you do get that perfect score, you deserve it after all!
assistant
Thank you. I will be so happy.
user