1. Knowledge of math and statistics: the field of big data requires some basic knowledge of math and statistics. If you already have a good grasp of this area and are interested in it, then it is relatively easy for Applied Statistics to cross-examine Big Data.

2. Programming skills: the field of big data usually requires certain programming skills, such as Python or R language. If you already have the relevant programming background and skills, then it will help you to progress in cross examining big data.

3. Ability to learn and stay motivated: the field of Big Data is one that is constantly growing and evolving, and to be successful across the exams, you need to keep learning and stay motivated. It will be easier to tackle the challenges if you have good study skills and are motivated to learn on your own.