how much difficult CLB 9

[santi_marlon]

Hello just give me your idea thanks in advance
for IELTS exam
if someone's level is CLB 8
and want to reach to CLB 9

1. how much difficulty has ?
2. should this candidate practice all existing material (MINDSET, BARRON , READY for ielts and .....)

thanks

 

[santi_marlon]

no any idea