Well you can obviously put can put your PDF on your iPAD via iBOOKs.
And I think you are able to downdown the Oracle eKit App for free ... whether thsi gives you anything with your existing PDF eKit I simply do not know. But you can try and report back.
I suspect Oracle will not upgrade your existing PDF eKit to a later eKit Plus.
I may be talking rubbish about all that. If I win the Euro-millions lotto I might buy an Oracle Training course, there again if I win the Euro-millions lotto I think I'll just eat Rasberry Pi. Others will know better.
I downloaded the Oracle University app (iPad) and logged in, but don't see eKit Plus of SQL course from 2009. Asked the question support guys and will let you know about the answer.
I know that the iPad is able to read a PDF file, but that's not the same.