Online work is not recommended. It's really cheap to go to work online, but it's completely different to answer questions in front of a computer and seven or nine interviewers in a real examination room. Many students usually feel good about themselves in front of the computer, but when seven interviewers really stare at you in the examination room, their minds go blank. It is true that the ground class is expensive, but if you really want to be admitted, I really suggest going to the ground class.