Congratulations on getting GP work experience. So hard to get.
You will want to make the absolute best of it.
So, will you make the best of it if you are twitching wondering what your results are ? What about all your friends and family saying "ohhh Melissa 200 - what did you get? I got x ..."
Will you be able to fake it if the results aren't what you want ? Or would you prefer a duvet day?
Of course, your results could be magnificent and you wont want to sit and listen to a GP when you could be out partying !
In any event you are likely to be distracted and phone focused. You could try and change your wex date, but as you say, they are like gold dust and GPs are so busy...
So if you go, 100% commit to it and try and stay off your phone !
Which option feels best for you / most comfortable? Only you can say...
Good luck whichever you do !