Congratulations and glad to hear someone being appointed in such present times of turmoil specifically in recruitments.
I understand your catch situation. You can contact one local institute Executrain. They are located in Al Wasal. You can google for their exact location, they have real good courses in Excel. You can contact Mr. Naresh Parmar, he is one of our CiteHR regular member as well. He will guide you on your requirements.