Hi

You are not able to download admit card and  it shows invalid application number or date of birth because

Admit card has been released for only February session and not for March ,April and May session for which you have applied and as you have not applied for February session you are not able to download the admit card for February session

For February session only,admit card has been released today on 11th February 2021

National Testing Agency will release  your jee main admit card for march,april and may session at its official page jeemain.nta.nic.in tentatively released 15 days before your examination . You can download your jee main admit card for March April and may session , once it gets released following the below steps

-) visit jeemain.nta.nic.in

-) select the option ' download admit card with application number and your date of birth’

-) now you need to enter your JEE Main 2021 application number and your date of birth

-) then enter the security pin which will be there mentioned on the screen and then submit

-)  your admit card will appear and then save it

For detailed information go through our page the link for the same is provided below:-

https://engineering.careers360.com/articles/jee-main-admit-card

Your JEE main admit card will mention details like :-

-) your name along with your photograph

-) your examination centre,

-)  your examination centre address ,

-) exam date,

-) reporting time to the examination centre,

-) instructions to be followed in exam and other details

Now that,

limited time is left for jee mains 2021 , so you should be focusing on your preparation,  practising chapterwise questions and then revising them, go through previous year question , and mock test papers as it will let you know your preparation level and and weak areas so that you can work on them and perform well in your examination.

Thankyou