CEIBS is located in the Pudong area. You can get to downtown Shanghai by
It costs about 50 RMB to get to People's Square
Take a taxi to Shanghai Science and Technology Museum Station, it will cost about 25 RMB, and then take the Metro to downtown which cost 3-4 RMB.
There are several bus lines you can take near CEIBS which will cost 2-5 RMB to get to the Metro station or directly downtown.