plz help me as well.

i am about to fill forms.i want my list to be like this,

PSP
FSP
Customs

i know about PSP and FSP becaz some people in my family are in it.but dont know about customs.plz tell me is it good for girls or not.
there is no pressure on me from home.infact they are asking me to put FSP at top.i am in a fix.dont know what to write.
are my preferences ok.