I vouch for K21 Academy for its exclusive course and exam preparation methodology. Recently I certified the Azure Developer Associate Certificate exam and it was all possible only because of, the instructions imparted by the trainer during the sessions which were highly comprehensive and beneficial.
The inclination on discussing real-world examples, solving lab demos during live sessions, and going above and beyond to answer any questions from the participants in a patient way, is incredible. The support was available to answer any issues (tech or non-tech) 24 hours a day.
I highly recommend K21 Academy for its valuable courses and career growth.