How can I maintain focus on complex legal briefs when I struggle with ADHD during long library study sessions?

I am a second-year law student currently overwhelmed by a massive stack of case law readings due by Friday. I have already tried the standard Pomodoro technique, but I find myself losing focus halfway through the first brief and getting distracted by my phone. I specifically need advice on how to structure my environment to avoid screen-time habits while analyzing dense, jargon-heavy texts. What specific concentration strategies do you recommend for sustaining deep focus during these four-hour blocks?