At the start of the space topic, a friend told me PM were the easiest things in the world once you do 20 in a row. At the time i thought he was just gloating, but sure enough even after 6-7 of these qusetions you do actually start seeing which formulas to use rather quickly.
Say you're given a question, any projectile question, you find: initial vertical velocity, initial horizontal velocity, initial total velocity, angle of elevation (if applicable), range, time, max height, final vertical velocity, final horizontal velocity, final total velocity and the angle. Now this may seem to be an awful lot to calculate but just do a few in a row, chances are you'll see a quick improvement in your calculations
And if there's a specific question that you can't do (usually the obscure ones) just ask here!
Alternatively, just wait till you do projectile motion in 3U.
