HELP!! Test or Assessment slide

It sounds like what you want is a Freeform drag-and-drop question. 

• Insert the image/illustration. 
  • Because you'll be editing & moving objects on top of the image, I suggest you lock it in place. To do that, click the corresponding checkbox in Lock-icon column in the Timeline. (Note: You'll have to unlock the image whenever you need to select it for editing, etc.)

• Insert objects over the drop-target areas. Either of the following would be invisible to the user:
  • hotspots (advantage—these will be visible to you while you're editing; disadvantage— hotspots don't have States)
    • I think this is the best option for your situation.
  • shapes with no border and a solid fill with 99% transparency (advantage—shapes can have States; disadvantage—these shapes will be invisible even while you're developing in Storyline)

• Insert the objects that should be dragged to the targets.
• Give all objects meaningful names. This will programming and troubleshooting easier. 
  • For a drag-and-drop, I indicate whether an item will be draggable by starting its name with "d-"; target names start with "t-". 
• Convert the slide to a Freeform Drag and Drop. The conversion button is on the INSERT ribbon.

• In FORM VIEW, indicate the Drag items and the Drop items. 
• Adjust the QUESTION settings as desired, including the Drag & Drop Options.

That's a basic overview. For details, here is the User Guide article about creating a Freeform drag-and-drop: Drag-and-Drop Questions in Storyline 360 - E-Learning Heroes (articulate.com) 

FYI: The User Guide has lots of good instructions for using Storyline. I suggest you bookmark it: Articulate Storyline 360 User Guide - E-Learning Heroes