Here’s a suggested 1-year study plan for JEE Mains, where you can focus on revising your 11th-grade syllabus while completing your 12th-grade syllabus:

Months 1-3: Foundation & 11th Syllabus Revision

Weekdays:

Morning: 2 hours of Physics (cover topics like Mechanics and Thermodynamics from 11th)

Afternoon: 2 hours of Chemistry (Organic & Inorganic basics from 11th)

Evening: 2 hours of Mathematics (Algebra, Coordinate Geometry from 11th)

Weekends:

Practice: Work on problems from 11th topics across all subjects. Focus on areas you find challenging.

Months 4-6: Start 12th Syllabus

Weekdays:

Morning: 2 hours of Physics (Electromagnetism, Optics, etc. from 12th)

Afternoon: 2 hours of Chemistry (Physical Chemistry and continuing Organic/Inorganic from 12th)

Evening: 2 hours of Mathematics (Calculus, 3D Geometry from 12th)

Weekends:

Practice: Continue with JEE Mains practice and start incorporating both 11th and 12th syllabus questions.

Revision: Dedicate a bit of time each weekend to revise key 11th topics.

Months 7-9: Focus on 12th with 11th Revision

Weekdays:

Morning: 2 hours of Physics (focus on 12th topics like Thermodynamics, SHM, Waves)

Afternoon: 2 hours of Chemistry (cover the remaining 12th topics)

Evening: 2 hours of Mathematics (focus on 12th chapters but keep reviewing 11th as well)

Weekends:

Mock Tests: Take practice tests and focus on areas that need improvement.

Revision: Spend a couple of hours revising 11th-grade topics.

Months 10-12: Intensive Revision & Mock Tests

Weekdays:

Morning: 2 hours of Physics (review both 11th and 12th topics)

Afternoon: 2 hours of Chemistry (strong revision of both 11th and 12th)

Evening: 2 hours of Mathematics (continue working on 12th but revise 11th topics too)

Weekends:

Mock Tests: Take full-length mock exams under timed conditions.

Final Revision: Focus on weak areas and make sure all topics are covered.

This schedule allows a gradual shift towards the 12th syllabus while keeping your 11th syllabus fresh. Remember, consistent revision and mock test practice are key to performing well in JEE Mains.