You should apply for credit transfer as early as possible. First use this site to confirm that your previous study may be eligible for credit transfer, and choose the OU qualification you would like to study, then make your application.
Once you know the outcome of your application for credit transfer it will be easier for us to advise you about module fees, the amount of time you will spend studying and which modules you need to study to complete your qualification.
You need to finalise your credit transfer award before you register to study your qualification so it is best to send your application as early as possible.