Yes you can combine the 600 hours you put in for student jobs with a maximum of 190 hours per year under the regime of association work.
Please note: You must not exceed those 190 hours. If you do exceed them, the extra hours will be deducted from your 600 hours quota for student work.
What happens when you have used up both 190 and 600 hour packages? For any extra hour you work you will pay the regular rate for social security contributions.
Please note: the association work regime also sets limits as for the number of hours you can work per quarter. Check the page The association work regime for more information.