Skill Boosting Probability

A lot of people are asking whats the best way to enhance to get from one skill level to the next.

These charts represent the probability percentages of increased skill level (left 1st column)  using each rarity type of card (top 1st row).

This chart was translated from one of my Japanese game sources. So far, I found any discrepancies. 

Understanding your Card's Skill Level Boosts

A lot of people have wondered how the skill levels and boosts work.

Skill Cards
From High Normal rarity card onwards, there are cards with skills which will affect how combat turn about by giving Boost or Hit on specific stats.
If you use these skill cards to enhance another card with a skill, it will give you a chance of increasing the skill level which is scaled according to the rarity and evolve state of the material card.
The probability of the skill level increase will show up right before you enhance your card