How should I divide my last 30 days before JEE Main between revision and mock tests?

In the last 30 days, stop learning brand-new topics and shift into consolidation mode. A workable split is roughly one full mock test every two to three days under real exam timing (9 AM or 3 PM to match your slot), followed by a full day of analysing that mock. Spend the analysis time only on the questions you got wrong or guessed, and note the exact concept that failed. Keep your high-weightage chapters warm: in Physics that is Modern Physics, Electrodynamics, Optics and Mechanics. Revise formulae daily from your own short notes, not the textbook. By the last week you should be doing more reviewing than solving, sleeping properly, and keeping your test slot timing fixed so your brain peaks at the right hour.