Vikh, 69 out of 100? Did you solve part C? Everyone is afraid of it, but in reality, if you write even part of the solution, you can still get points... although in this regard, part A is the most substantial.
You can get 1 point out of 3 for a problem just by correctly writing down the laws necessary to solve the problem. That's why I don't have 0 points for any problem.
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal