Forgot what you have learned in the RES course? No Worry. This Refresher Course is to help you refresh your knowledge. Unlimited access till you pass the exam up to a maximum of 2 years whichever is earlier. It is suitable for people who wish to retake the RES Course with a valid Attendance Certificate issued by an Approved Training Center. It does not replace the RES course. If you have not taken the RES Course before, please sign up RES Course with Hastor here. You can sign up for this online Refresher Course even though you have not completed your RES course (submit the proof that you are currently taking the RES course will do).