According to the MHRD (Ministry of Human Resource Development), the final merit list will be given by considering 40 percent weightage of qualifying exam that is 12th board exam and 60 percent weightage of JEE Mains marks. Also the candidate must secure 50 % aggregate and passed in all the five subjects taken in 12th along with Chemistry, Mathematics and Physics. JEE Mains is the eligibility criteria for appearing in JEE Advanced to get into IITs. After studies are completed and the candidate seeking a job in a company, they will definitely prefer a candidate with good academic record.
Percentage of marks required for IIT is 75 percent for candidates belonging to General, OBC-NCL and 65 percent to the candidates belonging to the categories like SC, ST, PwD. So the candidate who wants to appear for IIT exam must qualify 12th with 75 percent for General, OBC category and 65 percent for other reserved categories like SC, ST, PwD.
Second phase of JEE is JEE Advanced, only those candidates who are able to qualify JEE Mains will be allowed to give JEE Advanced. If got good rank in JEE Advanced, door to IITs will open. So it is important to concentrate on 11th and 12th from day one to get a very good percentage in 12th board exam.