All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
It appears –Allah knows best –that the mere registration of students is permissible. The person who enrolls students registers them for study and not for mixing. In addition to this, this mixing is not intended in principle: it may or may not happen; meaning that the student can avoid it.
Therefore the help that appears from this registration does not appear to be an intentional help and it is not a direct help, so it does not have any effect.
The resolution issued by the Council of Islamic Jurists clarified the types of help that are forbidden and those which are not forbidden.
The text of the resolution reads:
"The criterion of helping in sin and transgression is a subject of a long research and discussions among the members of the Academy of Islamic Jurists of America at its fifth session held in Bahrain in 1428 A.H. Their conclusion is that helping in sin and aggression is of four categories:
1 – Intentional involvement: like someone giving another wine for the intention of helping him to drink it.
2 – Unintentional involvement: such as selling what is forbidden that does not have any lawful use if he did not intend helping them in their forbidden use.
3 – Intended but indirect help: like someone giving another a Dirham to buy wine, which also includes causing the killing of someone.
4 – Indirect and unintentional help: like someone who sold what is used in what is lawful and what is forbidden, and did not intend to help the user in what is forbidden. For example, if someone gives a dirham to another person not to buy wine, so if that person bought wine and drank it, there is no sin on the one who gave him the Dirham, as long as he did not intend to help him to do what is forbidden.
This fourth category also includes buying and selling, and hiring the polytheists and dissolute Muslims, and giving money as charity to them. The council's decision forbade the first three categories and permitted the fourth category, which is neither a direct help nor an intentional one." [End of quote]
Allah knows best.