For the assessment you need to have a good level of English language skills. That is possibly why you failed. There are now no delays in Ryanair cadet training. The type rating takes approx 6 weeks. You normally base train within two weeks and then start line training immediately.
You don't get a choice of base but the airline is expanding in Dublin, East Midlands and Girona. So you may end up in any of these. You get paid from the date of the completion of your training.