For mechanics, you really need a lot of practice.
I would suggest knowing these concepts:
Fnet=m*a, where Fnet and a are all vectors
Fnet=vector sum of all forces
Vector components along a specific axis
MAXIMUM static friction is u*N, where N is the normal reaction force
Knowing that on a smooth, frictionless ramp inclined at angle t to the horizontal, the acceleration of a non-rotating object is g*sin t
Recognizing how to work out the gravitational force components along a ramp and perpendicular to the ramp to find the normal reaction force
Pulleys; tension forces in both sides of the pulley have the same magnitude
Systems of particles
And of course, the mathy parts:
Working out velocity and acceleration given the displacement as a function of time
Working out the displacement functions in terms of time given that velocity is a given function of displacement
Working out velocity when given acceleration in terms of velocity
And the worst of them all: solving the equation for acceleration in terms of displacement
I think if you're fine with these, you'll be mostly set (:
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