Left hand, right hand??

Do I understand this correctly?  On the one hand the Government intend to stop pupils retaking GCSEs over and over again in the hope of improving their grades - I think the rule is that you can have one retake and then that's it.  But on the other hand, the latest Government proposal is that if you don't get at least a C in maths and English at GCSE, you will have to continue studying those subjects and retaking the exams until you do.  Seems a bit contradictory.