There will be a multiple choice answer test of 50 questions for your RMDL (boat licence). If you are doing your PWC (jet ski) licence on the same day your multiple choice theory test will comprise 20 questions.
Do the theory component online and then come in for the final test and the practical assesment on the water.
Jet ski licences can be done at a later date if you only wish to do your RMDL on the day. When you sit for your PWC licence at a later date, there will be a 10 multiple choice question test (RMDL refresher) before your 20 question PWC test.