The only difference between the two is the different class hours. On-the-job MBA, that is, part-time MBA, is usually on weekends, which can avoid delaying the work of on-the-job employees, while full-time MBA is usually from Monday to Friday.
So, the difficulty is the same. Whether the exam is good or not depends entirely on your basic situation. If you have a strong learning ability, a good grasp of your basic knowledge and a correct learning attitude, then the difficulty of MBA written test is nothing to you. After all, English is CET-4 and CET-6, while mathematics is only the knowledge level of junior and senior high schools. As long as you are willing to spend some time, there is no obstacle to getting into the exam. But on the other hand, if your learning ability is average, your foundation is still weak, you can't remember the basic knowledge after working for a long time, and your learning attitude is to fish for three days and dry the net for two days, then the written test will be difficult for you. In fact, it is not just an MBA, but also any exam. If you have a good study attitude, if you can fish for three days and dry the net for two days, if you don't find all kinds of reasons not to study, then all the exams will not be difficult for you!