Verb conjugation of "discredit" in English

I have contacted you 12 months ago to propose your school's inclusion in our language school directory. I wanted to inform you that our site achieved high positions in search engines last month.
Spanish is very important and widespread. I want to improve my skills with the help of Vocabulix and its users. I'll be there looking for people and I hope that my new efforts will be helpful.
That is a beautiful name you have got. It would be very helpful if you answered my mail before next week because I will have my final test on Wednesday. I will understand if you won't be able too.