I dont know what to do...

There is a very big possibility that I will not graduate due to a credit issue between my current school and my last school. All I am lacking is a math credit. My current school requires 25 credits to graduate whereas my last school required 21-22 credits to graduate. At the end of this semester I will have 24. I dont have time to take an online class and I cant take it through Mesa Distance or Primavera since I am not living in Arizona at the moment. My school is picky so I would have to take it through a Online University Course. At the moment I am taking the first semester of Algebra 2 through BYU online and I believe I can pass that but I need to finish it. So if I pass that I would have 24.5 credits and then there is a .5 credit in question. I am taking the second semester of Algebra 2 but so far my teacher has managed to make me very confused by saying one thing one day and then saying another thing the next class.I have a tutor which helps a lot more than when I didnt have one last semester. My principal is no help and my parents cant really do anything for me. Though they have informed me that they will not be paying for EAC if I dont graduate. They were only willing to pay for EAC if I did graduate and now thats in question. I am really confused about this. I dont know if I would be able to take a summer school course this summer since I would be moving back to the U.S. and I dont know if I would be able to finish it in time. So basically I am stuck. And if I dont get my diploma I am basically screwed since my parents cant help me and this means a high chance of homelessness. I am so confused right now.