I clear the game without losing, some of the cheat are absurd really hard to lose if you know how to play Mahjong.
Here are the skill guide:
For Active skill you only need 2, Fateful draw and Deception. Other are pretty trash.
Fateful Draw make you hand closer to victory, it also increase your point when you use it before Riichi for that One-Shot Tsumo. I use solely this skill to win the entire game easily.
Deception are like a safety measure once you win a lot of point so you can just sit back and relax, knowing you can pretty much never lose at that point.
For Passive Skill, grab that Initial MP for more Fateful Spam.
As for the Bottom Passive Skill, what they do is each round, with 50% chance, you will start with specific set of tile.
Taatsu cheat (2 SP) - Taatsu mean a tile set that is one away from complete, for example a complete tile is 123, with this cheat you could start with 12,13,23. You can also start with something like 22, which is 1 tile away from 222.
In term of usefulness, it's okay, since a normal hand often start with bunch of Taatsu already, it help, but not obvious.
Shuntsu cheat (4 SP) - Shuntsu is something like 1,2,3 . 4,5,6 . 7,8,9 . So with this skill you will start with one of the complete set. Very useful.
Toitsu cheat (2 SP) - Toitsu is similar to Taatsu, but the tile you get will be the same one. There is no 12,13,23, only 11,22,33.
Ankou cheat (5 SP) - Ankou mean you will start with 3 same tile which make it a complete tile. Most useful, Ankou often contribute to higher point hence why this skill is more better than Shuntsu.