Hello Dear,

If your  name in the admit card of JEE main is not correct, then I'll recommend you to please contact at the following JEE helpline number for immediate resolution between 10 am to 5 pm:

JEE Main helpline numbers are - 7042399520, 7042399521, 7042399525, 7042399526.

Also, carry your 10th marksheet and ID proof on the day of your exam maybe that helps in your entry. For more details visit the link below:

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

good Luck