Using a nickname in SAT instead of first name as it is in the passport

I used a nickname on the SAT registration instead of my first name. I made already my PSAT, one SAT test and now a realized that I should change the nickname in my first name. Unfortunately, nobody answered at the CB phone for international students. For next examination would be useful to have a document from my school to certify that it is the same person?
Could anybody to modify the name at CB? Could remain like this and colleges will accept this?

Did you call today? Is the phone number based in the US? It’s a holiday here today, so if so, try again tomorrow during normal business hours.

oh dear. IF CB wont modify your name to your given name ,
what I think you will have to do is , when you are ready to send in college applications, email the admissions offices directly and let them know the name that your scores are being reported under, the name on your HS records and applications and THAT THEY ALL BELONG TO THE SAME PERSON.
Otherwise colleges will open up 2 files with different first names when they receive the various required documents. They wont know to combine them into 1 file unless told to do so.

Thank you! Do you think that I can change the nickname with real first name with the help of CB? Do they ever do that? It seems to me that it is almost impossible to find any help there. The school can certify that is the same person.

Call them on Tues. I dont know what can or cant be changed. But it is NOT an insurmountable problem.

Thank you!

I hope you plan to improve your English language skills before attending an American college.