Your brother didn’t get any aid from WCU because it is a for profit school and doesn’t give institutional aid. WCU IS a decent school, however, even if it is for profit. It is non predatory and does not have share holders collecting profits. One of the reasons it exists is because of the difficulty of getting into nursing schools in CA. All state programs are impacted and there are many more students than placements. WCU has excellent teachers and their simulation center is second to none.
One option for your brother is to get a BA/BS from his CSU and then get his his RN from WCU or another program after. That would probably save money. If he decides to go for the BSN make sure that he has taken ALL his prerequisite courses at a school that is not WCU. Only take nursing courses there. He can even knock out his prerecs at a community college.
One important question for your brother. If he is having trouble gradewise, is nursing the right degree for him? A lot of students have trouble passing their nursing boards which is one of the things that is causing low placement rates. A number of students end up taking the NCLEX more than once and they end up postponing finding jobs until they pass.
Full disclosure. I once worked at WCU so I do have a bias. I do not work there now.