The JEE Main 2021 question paper analysis revealed that the overall difficulty level of the exam was moderate. The Physics and Mathematics sections were slightly more challenging than the Chemistry section. The paper was well-balanced, covering all the important topics from the syllabus, and it tested the students' problem-solving and analytical skills.

In the Physics section, the questions were evenly distributed across all the chapters and the weightage was given to the topics such as Mechanics, Thermodynamics, and Electromagnetism. The questions were of moderate level of difficulty and most of the questions were based on the concepts.

In the Chemistry section, the questions were mostly based on the Organic and Inorganic Chemistry. The weightage was given to the topics such as Chemical Bonding, Coordination Compounds, and Thermodynamics. The questions were of moderate level of difficulty and most of the questions were based on the concepts.

In the Mathematics section, the questions were based on the topics such as Calculus, Algebra, and Trigonometry. The weightage was given to the topics such as 3-D Geometry, Vector Algebra and Integral Calculus. The questions were of moderate level of difficulty and most of the questions were based on the concepts.

Overall, the JEE Main 2021 question paper was designed to test the students' understanding and application of the concepts from the syllabus. It was a fair and well-balanced paper that assessed the students' overall preparedness for the engineering entrance exam.