Hi Gerallt. Prometric administers the test. Some centers offer a Test Drive, where you can actually go thru a "dry run" of the exam, including taking a sample test. Here's the link to the program:
www.prometric.com/en-us/for-test-takers/...a-practice-test.aspx
I took the exam in Nov 2017 . At that time touch screen was not option at the Prometric center that I selected, but that's not to say it isn't offered now and at other centers. Not sure if they had the option to cross out incorrect answers, but they do allow you to mark a question for review if you're not certain about the answer so that you can go back and review at any time.