Are you frustrated your teacher didn't write down the registration for your piece?
Know that this is good for you. Spoon-feeding leads to nowhere.
At some point you have to learn to combine stops by yourself.
Be forever suspicious of the teacher who not only prepares the registration, but other performance practice aspects as well. Sometimes long after graduation (sigh).
You will not learn to fly this way.
Make mistakes. Own them. Be proud of them. Mix stops in unbelievable ways. Let the listeners cover their ears.
Then perhaps one day they will say, "I'm glad we lived at the same time".