If I am not mistaken, what you said about Annex 3 is not in the headquarters, and it is wrong to enter the gate of Wu Da University.

This department only teaches one to five, and the engineering department teaches XX.

And the name of the "Attached Three" teaching building you mentioned is only Wu Ce, which is the information department of Wuhan University.

When you stand at the main entrance of Wu Da, you will find that there is also a door of Wu Da across the street. This door is a little lower-key than the main entrance, but it is still very nice. Then, on the way through this door, ask how to get to Annex 3. Most students will give you an enthusiastic answer.

Or take a bus directly to Guangbutun Station, and enter from the main entrance of Wu Ce, opposite the main entrance of China Normal University. You can find Annex 3.

Well, what I said is more complicated. In fact, it is very simple to go to the campus and ask your classmates. Everything is fine, hehe.