Following are the differences between the two:
JEE Main is for those candidates who wish to get into BE or B.Tech courses in the National Institutes of Technology (NITs), Indian Institutes of Information Technology (IIITs), other Centrally Funded Technical Institutes (CFTIs) and engineering colleges of the participating states. The JEE Main is also the eligibility test that allows students to give the JEE Advanced exam which eventually leads to admission in either the IITs or the Indian School of Mines (ISM).
The JEE Main is comprised of two papers, namely, Paper 1 and Paper 2. The Paper 1 is for those who would want admission in BE and B.Tech courses and Paper 2 is for those who want admission in B.Arch and B.Planning courses. While Paper 1 is held via the online and offline mode, Paper 2 is held only offline. While applying for the JEE Main exam, the candidates must specify if they want to appear for Paper 1 or Paper 2 or both.
JEE Advanced, on the other hand, is strictly paper-based. The candidates must sit for both Paper 1 and Paper 2 in this exam to get admission into engineering courses. For the candidates who wish to be admitted into architectural courses that IITs offer, the student must clear both Paper 1 and Paper 2 in the exam and then sit for the Architecture Aptitude Test (AAT) which seven zonal IITs conduct. The candidates must register online for AAT after clearing the JEE Advanced exam. The IITs don’t issue separate admit cards for the AAT exam, the students must take their JEE Advanced 2015 admit card along with them to the AAT exam centre. If the students receive marks higher than the cut-off finalised by the Joint Implementation Committee will be granted the ‘Pass’ status. The final selection of the candidates is on the basis of the All India Rank obtained by them in the JEE Advanced exam since there is no separate ranking system for the AAT.
The JEE Main exams can be sat for for three consecutive years but candidates can sit for the JEE Advanced exams for only two consecutive years. The syllabus of the two exams also differs. The JEE Main exams is on the same lines of the CBSE Class 11 and 12 Physics, Chemistry and Math syllabi. The JEE Advanced requires a few extra topics to be covered for the exam. The two exams also differ since to be able to answer the JEE Advanced questions, the candidates must have in-depth knowledge of the concepts and their applications. Speed and accuracy is focused on in JEE Advanced exams whereas in JEE Mains exams only speed is focused on.
JEE MAINS exam it for admission to National institutes of technologu(NITs), Indian institutes of information technology(IIITs), and centrally funded universities. While JEE ADVANCE exam is for admission to Indian institutes of technology(IITs).
To appear for JEE ADVANCE, first, student has to clear the cutoff of JEE MAINS.