Split it
Did mine in 2 bits on the same day Nav first then Gen Handling and it seemed the way to go.
If you are using a C150/152 you could have a fuel issue if you both are of a reasonable size.
I am 100kg,my examiner was 75Kg (thank God!) but I seem to remember that this still meant less than full tanks to stay under max weight.(about 3.5 hrs to empty IIRC).
After all the training,why rush this vital last bit?
Good luck whichever way you chose.
MM