All courses on the CPE provide you with 3 attempts to pass the assessment. If you are unable to pass an assessment within three attempts, you will need to repurchase the course (or re-enroll for a free course) in order to get further attempts at the assessment. 

To do this go to 'Search education' find the course you need to reattempt, add the course to your shopping cart and then follow the steps to repurchase the course.