This is not clear, at least graduates are almost impossible to pass the exam. You can refer to the following contents for planning (some of my friends just take this route).

It is suggested to go to the shipyard for quality inspection first, or jump out of the shipyard to be the shipowner's representative. It is basically impossible for a shipyard to jump directly to the classification society, because the shipyard is more cattle now, and the classification society generally does not want to offend the shipyard. However, it's hard to say in the future.

It is very unlikely to jump from the design unit to the classification society, so it is best to do it in the shipyard. The experience of the design unit is not worth mentioning at all in the classification society.

Strong work independence and good personal ability. The staff of the classification society is very lean. If you can't finish the work, no one can help you.