Hi all!
I Have plan to do SAP System Admin - SAP HANA Certificate, once my preparations is done from myside, I enrolled and gave online mock test regularly and with in a few days am able to score above 95% which build the confidence.
Then I gave the actual certification exam C_TADM55A_75 and now I am happy to say that I cleared it. I truly recommend this site.
All the Best Wishes.