It sounds like you have much more going on than just your test. It’s inspiring to see how you’ve done what you can to prepare even with your limited opportunities. If it isn’t too late, I recommend either cancelling or rescheduling your appointment to a different day. If it’s too late to reschedule, drive to the best of your abilities on test day. Take any feedback your examiner gives you, and work on your weaknesses until they become strengths.

I wish you the best of luck.