The Rank System in SoulCalibur V uses letters and numbers to differentiate between the tiers. To go up in rank you have to accumulate a certain amount of points, the points required for each trophy are listed as follows:
Awakened to Violence: 600 points
Reason to Fight For: 2400 Points
First Step of a Legend: 7400 Points
During the early ranking levels in E you do not lose points even when you lose. You earn roughly 100 points more or less for every win and about 50 for each loss, however once you reach D tier you will lose about 15 points per loss also keep in mind that if you lose too many fights after D4 you could be put into Ranking Down Matches and go backwards in rank.
Using the fundamentals listed under the Road Map and under the technical trophies play your matches smart. Here are some more bits of advice for those looking who are inexperienced in SoulCalibur:
Analyzing Your Opponent
Analyzing your opponent is important in every fighting game however, it is stressed greatly in a game like SoulCalibur V to have your defensive options ready and play passively if you need to analyze your opponent. Look out for the habits they have like how often they go for grabs and high and lows during there pressure strings, being able to open up your opponents play style is key.
Understanding Your Character
When playing with a character in SouCalibur you basically want to break it down to knowing your characters fastest pokes and punishes, fastest high and lows and fastest mix up moves. Practice makes perfect, go into Training Mode and play around with your character and go through there move list one move at a time. For general strategies and various discussions on your character, you can never go wrong with the 8wayrun Soul Arena Sub-Forums.
Understanding the Match up
Just like in all other fighting games, knowing the match up is very important, knowing the weaknesses of your opponents characters and what tendencies players who main that character have will make a world of difference if you can read there actions perfectly.
There is a way to boost this, however it can be a bit tedious and may possibly require a good internet connection between both players, for this boosting method please refer to Kagerasimarus "Best way to boost Online Ranked Matches From E5-D1 Trophies" thread.
If you are having trouble finding a partner, please refer to the Trophy Boosting Thread.