If English is your native language then it doesn't matter if your grades aren't great. Howevere they'll look at your background and work history when selecting for an interiew if your academic record is nothing to get excited about. Once you get past prelim selection and into the first (group) interviews the rest is up to you. So submit your reply and if you're invited to an interview yoiu can assume you have the right qualifications at least. the personality and character will come out in the selection process.