No problem. If you have got this far then you have a good background knowledge and I am sure that you will succeed.
Just remember that you can do it.
Also note that, if you havent already worked it out, the HMRC online calculators for PAYE and NIC (Directors and non-Directors) will now only work for tax year 2018-19 and not previous years so you will need to calculate these manually for the mocks and final exam - made that mistake on the first mock so learned from that.
Good luck with your studies.
I am taking the PM Dip exam tomorrow then moving onto the Self Assessment side of things.