Pulling Data From Individual Tabs Based On Drop Down On A Separate Sheet

I have a calendar based schedule that has 12 tabs. The 13th tab will be used for compiling data based on information in any one of the first 12 tabs. I have setup a drop down on the 13th tab that lets you pick the month that you want information from. I'm not sure how to go about this because I need information based on a known place in each tab but the second line of info can be variable.