I'm training in a C152 and the POH in the backseat has seen its days and I can barely use it, much less keep it from being getting worse than it is. This is a 1983 C152 Trainer aircraft. A lot of questions that I am doing in my flight planning and solo quizzes can be answered through the POH but because the plane is shared I don't want to take it out of the cockpit because it would anger other pilots who also need it. Is there a resource online I can find the POH? Also, I'm not sure but I figure I can't use any C152 POH, it has to be the one for my year and model, is that true too?
Strictly speaking the POH/AFM is specific to your airframe as it generally contains the weight and balance information which will be unique to your airframe as it is equipped. Thus you should always reference the POH that is in the plane for the most accurate source of information.
For example here is a nice scanned PDF of a POH for a C152. You should confirm that the numbers match those in the POH for the airframe. As long as they do you can use it for reference. The POH does not need to match for the specific year but it does need to match for the given aircraft configuration and setup in regards to the engine and performance data as well as any data related to things like extended range tanks etc.