Heyup,
This works for me.
Have a good solid outing on the bike 2 days before (tomorrow, Thursday).
Rest for a couple of days, eat and drink well (no boozing the night before). Have good meal evening before and try to get a breakfast down you.
Nibble and drink throughout the ride especially during the first half/two-thirds of the ride.
Pace yourself, look at the hill and if you know you cannot ride it all stop and push before you blow up.
Good luck
Paul