NIK, do your renewal before the first!
I am lead to believe, unsubstantiated, that you must pass both 2D and 3D. If you don't have the ability to do 3D, there is a clause to not require it. Otherwise you must do each in the test, and a fail on one means a fail of the lot and a re test (but the re test only on the one you failed- it just means u cannot use the one you previously passed on in the mean time)