Regulation R638 Knowledge Test (30 min) You cannot view this lesson as you're not logged in yet. 2 thoughts on “Regulation R638 Knowledge Test (30 min)” I’m having problems with my 3g card keep losing the signal. I did not get chance to finish my test. Reply Hi Gammedah, With reference to our telephonic support. We resetted the test and you can try again. Please let us know if you encounter any other issues. Kind Regards, ASC Consultants Support Reply Leave a Comment Cancel replyCommentName Email Website Save my name, email, and website in this browser for the next time I comment.