I am on top of that !!!

Michelle	Renee, did you talk to our suppliers about our promotion details ?
Renee	Yes, I did. I've asked them to insert fliers into the shipments to our customers. That way the customers who never bought our CB series can also receive the information and know about our promotional products.
Michelle	Do you need someone to help you send messages to customers by email ?
Renee	No thanks. That's my job. I am on top of that.
Michelle	Oh, and did you discuss the exhibitions we talked about last night with our channel ?
Renee	Of course I did. And they've promised to help us with that
Michelle	Wow, I'm impressed. Renee. You've improved a lot as a sales representative.

Explanation :

On top of sth - To be able to control a situation or deal with it

Example : The stock market has been unpredictable, and you really have to stay on top of your investments.