Four weeks ago I took the Salesforce Marketing Cloud Administrator CRT-250 exam. It has 60 multiple choice questions in 105 minutes and passing is 67%. I started with the official Salesforce guide but it was not enough for the scenario based questions. I was struggling with subscriber data and setup topics and a friend from work suggested itexamstopics.com so I tried their desktop version for CRT-250 Exam Questions. The interactive desktop platform with tracking helped me improve quickly.
What helped me most was practicing with exam-style questions instead of just memorizing. I gave most time to Setup at 38% with around 23 questions and Subscriber Data Management at 18% with around 11 questions, then Channel Management at 16%, Maintenance at 15% and Digital Marketing Proficiency at 13%. I did several rounds of practice questions, real exam questions and sample questions which made the actual exam much easier. If you are preparing for CRT-250, check their free demo first - their Exam Questions are very close to the real exam.