Acrobatics - C
Animal Handling - D
Arcana - C
Athletics - C
Deception - C
History - C
Insight - A
Intimidation - C
Investigation - D
Medicine - C
Nature - D
Perception - A+
Performance - F
Persuasion - B
Religion - C
Sleight of Hand - D
Stealth - B, A+ if rogue lvl2
Survival - C, B if ranger, D on everyone else if there is outlander background in the party.
now,
Sleight of hand should be packed in with thieves tools and be called larceny or thievery.
Animal handling should be merged into survival.
Investigation should be deleted. Traps should be all on perception and solution to riddles should be on players themselves not on die rolls.
optional rule; synergy bonuses for being trained is a skill.
if you are trained in some skill, that skill could add +1 mod to some other skills. Think as that as cross-discipline training and education.
Acrobatics gives +1 to athletics,
Athletics gives +1 to acrobatics,
Deception gives +1 to insight, persuation and intimidation,
Insight gives +1 to deception and persuation,
Nature gives +1 to survival and medicine,
Arcana gives +1 to thievery for magic traps,
Survival give +1 to medicine,
Arcana, history, nature and religion give other "knowledge skills" +1. So if you have all 4 trained you get extra +3 to all.