Is it permissible to conclude a marriage contract with a foreign Muslim woman and waive her nafaqah (financial support) for the current time, with the intention of solemnizing the marriage later after graduation, due to not possessing sufficient funds currently, or is it obligatory to wait until one is able to provide nafaqah?

If a man marries a woman with a valid marriage contract, and the wife willingly relinquishes her right to maintenance or housing, and she surrenders herself to him, then there is no harm in that. It is important to note that the wife has the right to retract this waiver and demand her right to maintenance or housing, because her right is renewed.