Hey Nivetha,

Joint Entrance Examination (JEE) is an engineering entrance examination conducted for admission to various engineering colleges in India. It is constituted by two different examinations - JEE Main and the JEE Advanced. The exams are of the objective pattern. JEE Advanced is regarded internationally as one of the most challenging undergraduate admission tests.

In 2012, the government-run Central Board of Secondary Education (CBSE) that earlier conducted the AIEEE, announced the JEE that replaced the AIEEE and IIT-JEE. The JEE-Main, which replaces AIEEE, is for admission to the National Institutes of Technology (NITs), Indian Institutes of Information Technology(IIITs), and some other colleges designated as "centrally funded technical institutes" (CFTIs). The JEE-Advanced, which replaces IIT-JEE, is for admission to the Indian Institutes of Technology (IITs). Only the students selected in JEE Main are eligible for appearing in JEE Advanced. About 224,000 students will be selected from 2018.

There are some institutes like the Indian Institutes of Science Education and Research(IISERs), Rajiv Gandhi Institute of Petroleum Technology, and the Indian Institute of Science which use the score obtained in JEE Advanced as the basis for admission. These are not participating institutes of central IIT JEE Advanced counseling of which all IITs are members. Any student who takes admission to IITs cannot appear for the JEE-Advanced exam in the next year, but the same is not the case with IISc, IISER, RGIPT and other institutes as these institutes only use JEE Advanced score for admission.

Entrance Examination (JEE) MAIN will be conducted by the NTA from 2019 onwards. This Examination was being conducted by the Central Board of Secondary Education (CBSE) till 2018.                               

JEE Main is applicable for admission to NITs, IIITs and CFTIs participating though Central Seat Allocation Board subject to the condition that the candidate should have secured at least 75% marks in the 12th class examination, or be in the top 20 percentile in the 12th class examination conducted by the respective Boards. For SC/ST candidates the qualifying marks would be 65% in the 12th class examination.

Hope it helps ,Thank you

Hi Nivetha Murugan.This is Neeraj Atluri.JEE is the national wide entrance exams conducted to get a seat in Engineering colleges mainly.It is divided into mainly 2 types.JEE MAINS,JEE advance. If you qualify for JEE MAINS then you will be elgible to write JEE ADVANCE.IF you qualify JEE Advance, you can get an admisiion in IIT's.By qualifying JEE Mains you can get admissions in NIT's.This exam play a key role in the entrance of an student to an engineering college.

Joint Entrance Exam (JEE) Main is the national level undergraduate engineering entrance exam conducted by Central Board of Secondary Education for admission to BTech/BE programmes in 31 NITs, 23 IIITs and 22 CFTIs. JEE Main also acts as the first stage or preliminary exam for admission to 23 IITs including ISM Dhanbad. 

It gives you admission to the engineering colleges. The exams is based on the course of 11th and 12th class. JEE main acts as a clearing exam for the JEE advance, that makes you elegible for admissions in IIT's. There are many private and semi-goverment colleges takes the score of JEE main as an admission criteria.