SoP: Våno skola (Bonus)
Detailed instructions
In order to solve the mystery and find this cache, you need to gather the values for Q,R,Y,Z from the other caches in the Schools of Pargas series. The final coordinates can be calculated from the given bogus coordinates, as follows:
N = N-Y+Q+360
E = E-Z+6*R+70
You can use the GeoChecker at Geocache.fi to verify that your calculations are correct:

Schools of Pargas
Pargas skolor / Paraisten koulut
SV: Serien Schools of Pargas (Pargas skolor) består av gömmor i närheten av Pargas grundskolor. Det finns inga pennor i gömmorna, så ta med dig egen penna!
FI: Schools of Pargas (Paraisten koulut) sarja koostuu Paraisten peruskoulujen läheisyydessä sijaitsevista kätköistä. Kätköissä ei ole kynää, joten ota oma kynä mukaan!
EN: The Schools of Pargas series consists of geocaches in the vicinity of elementary schools in Pargas/Parainen. There are no pens in the containers, so bring your own pen!