hello Rashmi


as you choose engineering catogery as i see in your profile ,so you must be asking about jee main,so

form filling of jee main should be done by going on there official website i.e

jeemain.nic.in

well for knowing step by step process you can visit the below link

https://engineering.careers360.com/articles/how-to-fill-jee-main-application-form

and for detail syllabus of jee main, you can visit this link

https://engineering.careers360.com/articles/jee-main-paper-2-syllabus-2019

Hope this will help you!
further ask your queries if you have