TeenAgent

You take the role of Mark Hopper, an ordinary teenager who gets hired by the RGB intelligence (he was selected by a fortune teller) to solve the mystery of gold disappearing from the Mega Bank. But first you're sent to the RGB training camp where you'll have to pass the three trials!

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Teenagent is a humorous point-and-click adventure, originally available as shareware, but the DOS version was later re-released as freeware. You control Mark Hopper with a mouse - click on where you want him to go, left-click on objects and people to look at them, and right-click on them to interact with them. By moving the cursor to the top of the screen, you bring up your inventory.
 (Note: the game isn't connected in any way to the 1991 movie Teen Agent.)