Verb conjugation of "dip" 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.
Could you please read the following offers in a critical manner and confirm it before I will send it? I have also mentioned the warranty and the software in the offer, because it was requested by the customer.
Tomorrow I have my test, so I have to practice a lot, but it should have started to study much earlier. I can only act under time pressure, I'm just like that... . I am 25 years old and I am married.