JEE Mains is usually held twice a year, once in January and then again in May. As this year JEE Mains 2nd session is being held in July, the admissions will be completed by September. The Classes might start around the same time as well. Now the Union HRD Minister did inform that JEE Mains and NEET syllabus will be reduced which means the schedules might be still in Januar and May but with reduced syllabus. The current lockdown period will hopefully not have any effect on 2021 schedules.