10 x 37.5 = 375

study days
4 x 7.5 = 30

uni days
8 x 7.5 = 60

so,

full hours
375 - 60 - 30 = 285

so we have to do an average of 28.5 hrs a week

which is
about 25 x 11.5hr shifts


or 38 x 7.5 shifts