Joint Entrance Examination – Main (JEE-Main), previously conducted as All India Engineering Entrance Examination (AIEEE), is an examination organised by the National Testing Agency (NTA) in India. AIEEE exam was introduced in 2002. Renamed in 2013, JEE Mains is a national level competitive test primarily conducted for admission to various undergraduate engineering and architecture courses in institutes accepting the JEE-Main score, mainly National Institutes of Technology (NITs), Indian Institutes of Information Technology (IIITs) and Government Funded Technical Institutes (GFTIs).
The (B. E. /B. Tech.) of JEE (Main) will also be an eligibility test for the JEE (Advanced), which the candidate has to take if he/she is aspiring for admission to the undergraduate programs offered by the Indian Institute of Technology (IITs).
Until 2018, JEE-Main was on the first week of April by the Central Board of Secondary Education (CBSE). It was held both on paper and electronically. From 2019, it is conducted by the NTA, twice a year, and online only.
The examination consists of only two papers: Paper 1 for B.E./BTech courses and Paper 2 for BArch and BPlanning courses.[3] A candidate can opt for any or both the papers. Paper 1 is mandatorily a computer based test (called Online mode) from 2019.

The exam is offered in English, Hindi and Gujarati. From January 2021, it will be offered in eleven languages.

Participating institutes
Institutes participating in the 2017 centralized seat allocation process included:[11] The 31 National Institutes of Technology
The 24 Indian Institutes of Information Technology
19 other central government or state government funded institutions including the three Schools of Planning and Architecture.
Several self-financed institutes (during the spot round).
Many other institutes used JEE (Main) ranks to fill seats through their own seat allocation processes.

JEE Main April 2020 Application Form