I would agree with Lock's comments about English. When you go for your interview they will be looking not just for controller skills potential but also your ability to express yourself clearly and succinctly.
As to your questions, there are no right or wrong answers to many of the scenario questions that you may be asked. The interviewer will be looking to for your ability to explore practical options. Knowledge of the rules will be helpful - but most of them are common sense so, if you don't know what the rules are, say so but also that you imagine there will be a specific criteria to be applied in the situation.
More particularly,
If a supervisor really did do something like this there will be a reason - a reason that you must establish - with this information you will be able to make a sensible judgement. If the supervisor's aircraft has an emergency, unless you have one with an emergency that trumps the sup's, his gets priority. When ATC is being provided, different flight priorities are more important than rights of way.
There is new legislation about the amount of alcohol that a controller can work with. The question is probably trying to find out whether you know about it. Each unit will probably have procedures for such situation. The textbook answer would likely be that you would advise a responsible person so that the procedures can be applied. You also need to ensure that you do not become overloaded so you would need to tell your colleague the maximum number of aircraft that you are prepared to accept. If that makes no difference, put some aircraft into a hold so that they are safe. Like I say, perhaps that's a textbook answer.
You probably shouldn't have got yourself into the situation withthe Cb. If you know there is bad weather about you want to leave yourself options. If you can't turn left or right you probably can't do a U-turn either. You're up a dead end. Much of the job of a controller is to have a plan B waithing for every aircraft. If the worst comes to the worst, it would be better to vector the aircraft away from the Cb even if you have lose separation - use 500ft instead of vertical for example than to allow it (or send it) into dangerous weather.
Wake votex separation. Look it up -
MATS Part 1.