Harder Chart Questions

Need sources for harder DI and Charts questions.

Anyone who recently gave the GRE can you please tell me what resource is on a comparable level.

Big Book chart questions becomes harder as the number increase i.e. 25 is easy and 30 is hard/very hard! (Can practice a lot of 28-30 questions) that way ! Can also look at Graphics Interpretation (GI) questions from official GMAT guides !