According to WAPA Brochure:
https://pilot-academy.wizzair.com/as...re_UNIFIED.pdf
These 14k are good for about 5 months of training (including part of ATPL theory). So you might already have PPL + some practice stuff towards IR or ME. After these 5 months you will go through phase check. And I'm nearly sure that if you will be able to pass your PPL then you'll be also good for their phase check. What else they might ask you other than thing you learned during PPL and some pattern flying or VFR flying?
I think you should not be concerned about that phase check unless you are going to totally skip your lectures and so on. Please keep in mind that airlines are generally in need of pilots these days. And 5 year bondage is what they really look for. No matter what - they will have you. Will easyjet call you with twice as good salary? NOPE - you're bound and if you leave then you need to pay off everything fast.
Have you been on these budapest screening days already? Ppl there are generally dressed as for job interview (suit and tie) or more casual?