The ceiling and the success rate is as follows:

The sum of the attack and attack grinding is maximum upgrade to +50
100 points once and increased by 1 attack
0-50 100% success

The sum of the defense and defense grinding is maximum upgrade to +50
100 points once and increased by 1 defense
0-50 100% success

Attack rate is maximum upgrade to +200%
150 points once and increased by 1 attack rate
0-150 100% success
151-200 70% success,30% remain the same level

Defense rate is maximum upgrade to +50%
150 points once and increased by 1 defense rate
0-40 100% success
41-50 70% success,30% remain the same level

Hp is maximum upgrade to +3000
300 points once and increased by 100 HP
0-2000 100% success
2001-3000 70% success,30% remain the same level

Hp+MP+SP recovery rate is maximum upgrade to +30%
300 points once and increased by 1% recovery rate
0-20 100% success
21-30 70% success,30% remain the same level

Hit rate is maximum upgrade to +200%
150 points once and increased by 1% hit rate
0-150 100% success
151-200 70% success,30% remain the same level