Yea you read it right, here are Ranger's Advanced class' skills with their branches. 
Also, feel free to discuss anything related to Rangers here 
SNIPER
-as the class name implies, theyre focused on killing enemies from afar, dealing massive damage per hit (possibly the best single target damager). You need to be accurate at attacking with this class since they lack AOE skills.
• Sniper Eye:
Passive Skill, Level 10 gives +4 STR, +3 DEX, +3 MEN. Nothing exciting, but the stat boosts are welcome.
• Spike Shot. SP:11
>This skill fires blue arrows instead of the regular orange ones. It can be used 3 times in quick succession, first press fires 2 arrows, second press releases 3 arrows, and the third press releases 1 extra powerful arrow that causes the character to stagger backward. This can be a normal attack replacement for Bow Users. Great both PvP and PvE.
- Type A. SP:11 ~ Stable type with stable damage and short rigor. (Best type for pvp, has the shortest rigor)
- Type B. SP:14 ~ Fire Power with improved power by consuming more SP. (If you're focused on farming, get this branch)
- Type C. SP:14 ~ Auto fire type with faster fire speed by consuming more SP.
• Mirror Pierce, SP:22
>This skill makes the Ranger do a firing animation, but 3 arrows forming a "W" will appear as if a mirror image 6 feet in front of him shot them back. The animation is quick, and the projectiles even faster, so it's a good skill to cast in PvP. It's fairly useless in PvE because the damage is equal to one arrow from Spike Shot, but the SP cost is too big. This is also the Sniper's only MATK based skill.
- Type A. SP:19 ~ Saver type with less consumed SP by holding power.
- Type B. SP:22 ~ Concentration type with higher power but with increased cool time.
- Type C. SP:22 ~ Balance type with stable damage and short rigor. (Shortest rigor makes it easier to dodge on pvp aftr using it, pick this for pvp purposes)
• Shooting Star, SP:24
>The ranger does a backflip and shoots an arrow diagonally at the spot where he kicked. Visually impressive, but the damage is average. Great for PvP against classes that get too close, bad in PvE as most Snipers stay away from mobs anyway, and Spike Shot is a better use for SP. This is the only attack that gun users can use from the Sniper skills.
- Type A. SP:23 ~ Balance type enhanced with improved stability.
- Type B. SP:24 ~ Irregular type that release arrows when firing with a time lag.
- Type C. SP:24 ~ Type that increases the arrows when firing and widens the range. Slight longer rigor. (More chances to hit but u are also more likely to receive hits)
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TRAP GUNNER
-lacks offensive type skills since they are made mainly for support. Can disable/damage enemies with traps and do minor healings for injured allies.
• Balista. SP:22
>A shot that works similar to blow chain but release one spear type ammo instead of 3 large exploding shells. Also knockbacks the enemy. Good for pushing the enemy on a trap behind. Can be used with a gun or bow.
- Type A. SP:20 ~saver type. Less SP.
- Type B. SP:22 ~combo type. Stop holding after start and faster start of the next skill. (Shortest rigor, for pvp purposes)
- Type C. SP:22 ~can be charged for more power
• Medical Box. SP:24
>Places a healing orb on the ground for some time that heals a little amount of hp of any allie who walks through it. Will disappear afterwards. Spam this box on the field so allies can just walk through them and receive a "first aid".
- Type A. SP:24 ~adjusted cool time.
- Type B. SP:24 ~longer time set.
- Type C. SP:24 ~larger recovery amount.
• Wide Flowers. Sp:25
>Sets a flower like trap on the ground that will damage nearby enemies. Has chance to put enemies to sleep, making them very vulnerable to you and your allies' attacks. Best used on a stunned opponent, let him/her sleep forever lol. This skill is very good on team plays.
- Type A. SP:25 ~adjusted cool time.
- Type B. SP:25 ~extended time set.
- Type C. SP:25 ~affects multiple enemies. Kept during time set. (Best branch for gvg/tower)
Hidden skill
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GUNSLINGER
-prefers short to mid distance fights. They deal lower damage than Snipers but they can hit multiple targets at once with plenty if AOE skills which Snipers lack.
Blaster
>Fires a large shell that will explode once it hits the target. Damages the enemy twice. First hit is single damage, but the explosion is aoe. Deals decent damage but makes you vulnerable for a short period since it does an animation of reloading a large shell into your gun before firing it. The only GS skills that can be used with a bow. Also take note that the explosion is Fire elemental.
- Type A. ~firepower type with improved explosion power by targeting the distance into mid distance.
- Type B. ~spread type with wider explosion range but with more explosions.
- Type C. ~far distance type with more distance adjusting the bullet.
• Assault Barrage
>A plunge and faster version of Multishot but only does 3 stronger hits. Be careful when using this one since it shortens your distance from your enemy.
- Type A. ~Combo type adjusted to be used with continuous usage.
- Type B. ~Fire power type with improved power.
- Type C. SP:17 ~Balance type with a more stable performance by consuming less.
• Reflex
>Fires some reflecting bullets on an enclosed area. Enemies inside the area will receive damage overtime(up to 5 hits). Total damage is almost equal to multishot or barrage's total damage.
- Type A. SP: 23 ~Adjusted type that can be used for long battles by holding consumed SP.
- Type B. SP:27 ~Type meant for continuous usage by shortening cool down.
- Type C. SP:27 ~Endure type adjusting the placing time to be longer.
~pm me if you want some info on how to build a decent gunslinger on pvp (skill wise). This will be a bit complicated since you'll be using different skill sets depending on what's your opponent's class. You can beat ppl with better gears using these skill sets.
Credits
-@Grawrz for Trap Gunner's Blast Trigger and Sniper skill branches, SP usage and neat skill description
-@niteshade999 for Gunslinger skill branches.
Advance classes FAQ (to be updated)
Q: Will my jxp be reset after advancing my class?
A: No. You'll have a separate jxp for advance classes. Your jxp from ranger will remain there, same for your skills.
Q: What advance class should i choose?
A: Sniper if you want some range, Gunslinger if you want to fight head on with short ranged skills. Gambit is kinda hard to use so i dont recommend it as main class. Trap gunner is mainly for support.