Need a solution with RouterBoard750G

Please help me out to solve this thing. I added some photos you to understand the problem.

In “Photo 1” You can see the university network in our dormitory. University brings internet to cisco managable switch then sends to switches in three different buildings Block A, Block B and Block C from managable. And any PC connected to switches in blocks, can reach free internet with automatic IP. Each block has different gateway.

Block A Gateway 192.168.152.1
Block B Gateway 192.168.151.1
Block C Gateway 192.168.153.1

In “Photo 2” You can see we are providing a private internet connection to school network in our dormitory. I mean we have IBM Server and Cisco Router.. And we give our connection from cisco router to our switch. Then from our switch to university’s cisco managable switch. So our connection is distributed to university network in dormitory. So that, each PC can connect internet with PPPoe connection with the username and password we sell. Users use university internet freely when they are connected to network. And if they wish they can make pppoe connection and use our fast internet. Hope you understand.

In “Photo 3” You can see we want to provide this PPPoe connection as wireless with access point. But when i connect AP to our switch, because of it is giving connection to university network. Like in normal network, when users connects to AP, they can use free internet. We want to isolate this schools free internet from AP. I have RouterBoard 750G and i havent used it before. Could you please describe me what to do step by step.

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