Your thought process should be the other way round. Take what the instructor teaches you back into FS and you will find your flying experience in FS will take on a new dimension. This is where FS changes from being a game to a tool. Some instructors I know use FS as a training aid and he might well suggest some specific things to practice as you go forward. After each lesson you’ll be able to go home and practice exactly the same thing in FS, over and over.
Don't be afraid of telling him you use FS and any aspect of flying you have a problem with in FS - relative to your new learning experience that is. Don't expect him to tech you about GPS navigation in a 777. He will not be critical of your FS experience unless it proves that you have picked up some bad habits or misconceptions. You might even find you need more training to get you out of any bad habits you have learned from FS.
Your instructor has a set syllabus for your flight training and will take you through every topic. Ask him for a copy if he hasn't given it to you already and you can monitor your own progress. He will constantly assess your knowledge and skill and, unlike FS, you will not move on until you can demonstrate to him you have a firm understanding or required skill level in any of the topics. He has to put an entry in your logbook to show you have performed the subject and eventually sign you off to take the checkride and the theory test.
Expect roadblocks. Accept not being able to do something first, or even 10th time around. If he is any good, he will adjust his technique to help you understand anything with which you are having a problem.
Be honest with him and yourself and make no assumptions in what you think you already know. He will become your friend, your source of knowledge and your mentor.
Work hard, expect setbacks, accept criticism gladly but most of all, enjoy the experience. Good luck for 7th March. See you in the pattern.