score:5
You can take a bus from the Airport to Goch, then a train to Kleve (Niederrhein) and another bus to Nijmegen. Theticket from the Airport to Goch would cost 2,40 EUR
From Goch you can take a train to Kleve and then Bus SB58. One way ticket costs 10,50 EUR(VRR Tarif). DB-Bahn shows it costs 4,90 EUR, however I don't know if you have to pay extra for the part between Nijmegen and the Kranenburg (German Border). You can see the timetable on DB Bahn website