Please Help - Need Advice

i am a cna & i want to work at a healthcare temporary agency b/c i will start nursing school in late august. if i start working for them let's say in early april (by the time i have interview & submit application), is that too short of a time to work at a temporary agency april-august or is that ok?? i am going to look for volunteer/prn/part time work when i move on campus (campus is 4 hrs away from home) & i want to put down that i have worked as a cna b/c my last job ended june 2007 & i need to keep my cna in current status. i don't want to wait to long to apply & i don't really want to just put down on my resume that i only worked during the summer b/c they are in desparate need of cnas & i need the $. what should i do?