If you are new to lifting, I would say that the most important thing BY FAR is to make sure you are using appropriate technique. Going from 135 to 315 is a massive improvement over 6 months. This happens with newbies, but not often by that much. Sometimes, in our quest to hit higher numbers, we let form go by the wayside. Not implying that this is the case here, but if it is, I would be willing to bet that you would be much happier knowing that you nailed a true 250 lb squat with proper form, rather than doing 315 with crappy form.
My suggestion: post a video here for feedback and suggestions for improvement if required. People here are very helpful.
Once technique is perfected, picking a program suitable for beginner/intermediate (the latter if you are really at 315) would be the next step. Then the challenge is to stick with it as you progress. As Matty mentioned, 95% is way too much load to do on a regular basis. Are you deadlifting as well?