Hi,

see you can attempt jee main exam for two sessions or if you want you can only choose to appear in only one session, now coming to category issue, it is possible to change the category from general to ews category in april session, however for that you need to newly apply for jee main april session with new mail id and phone number, jee main april session form filling was restarted from May 19 to 24, 2020, you may use careers360 jee main knockout program to boost up your performances,

https://learn.careers360.com/knockout-jee-main-april/