Pick a single thing to focus on and maintain sustained effort on it. Pump brown noise/ambient noise into your head at 3 to 6 hour intervals while you study. Tell other people to go hell if they bother you. Disconnect from the internet, use offline materials, and keep your phone in airplane mode. Repeat until goal is satisfied and move on to the next thing. If you focus on one thing you don't need a schedule since you just do that one thing every second you are free. Having less time forces you to manage your time better. Minimizing the bullshit in your life is also helpful and may actually be a prerequisite before you can get anything meaningful done.