What if I take the test then I want to skip to another test question then after a while I want to go back to the test question I missed, Is there any code for it?

If you allow a recurring approach to a question you can go back to it, thats probably not quite what you are looking for though. Recurring approachs allow the question to be 're-taken'

An afterthought.. As you'll effectively be using the scorm tracking you might want to look at the status skipping a question sets. If skipped doesn't set that question as failed or completed then it should be possible to return to it.