Disabling the submit button until all items are dragged onto a drop target

It would be much easier to tell if you could attach your .story file. Just guessing from what you posted, you could set a T/F variable for each item that would be changed to true if its state was Dropped Correct OR Dropped incorrect. Then make Submit visible if all variables are True. If you show all the drop targets at once, and the user can drop them at random, you may have to write a trigger for each variable to make Submit visible when it is changed if all variables are True.

Hi Walt,
I am very much an amateur when it comes to variables but your recommendation to set a T/F variable was enough to trigger what I needed to do and it works. 
Thank you very much.
cheers, Robyn :)

Aw, this response made me smile Robyn - that's what the community is all about!  If you're new to Storyline you may also want to look at bookmarking pages such as the Storyline tutorials here. 

Also, you can always upload the .story file or a sample file for us to take a look at as Walt mentioned. Let us know if you need anything else! 

Thanks Ashley.  It was a very complicated resource that I was creating and I had to do a lot of things that I had never done before.
I have been using Storyline for quite a while now and I did the two day course but unfortunately was unable to do the third day where variables were covered.  So I'm an intermediate storyline user but beginner at variables.  I must try and find time to do some tutorials to get a better understanding of variables and what they mean. 
Thanks again.

We all have to learn somewhere - and still after being with Articulate for over 2 years, I learn something new every day. :-)