To get an admission in the IISERs with a maths background you have 2 ways:
1. First you have to qualify JEE Mains to appear JEE Advance and get a rank within the top 10,000 AIR to apply for the admissions in IISER .

2. Or else , All the IISERs together carryout separate exams in order to give students admission called the SCB or STATE AND CENTRAL BOARDS CHANNEL. 

• Students who have passed 10+2 level with science stream in 2018 or 2019 are eligible to apply for admissions and appear for IAT 2019.
• Students applying through SCB channel will have to appear in the IISER Aptitude Test (IAT) which will be conducted at various centres across the country.
• IISER Aptitude Test (IAT) 2019 will be conducted in fully computer-based test mode. IAT 2019 is likely to be held in June 2019.
• However, they will be considered for admissions to the degree programmes only if they obtain the cut-off marks specified for their board.
  
  3.KVPY channel: If you have qualified KVPY you can apply for admission in IISERs.
  
  For further reference :
  
  https://www.iiseradmission.in/?page_id=8
  
  

Hello,
You need to firstly appear for jee mains then qualify it and then you have to appear for jee advanced in order to bevome eligible for admission in this college.To check eligibility criteria, visit the below given link:
https://www.iiseradmission.in/?page_id=8
Good luck.

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