Hi! Simmi, 
Important date regarding jee mains 2019 (April)  are given below :
JEE Main Dates 2019 - April
Events
Dates
Online availability of application form
February 8, 2019
Last date of online application form submission and uploading of scanned images
March 7, 2019
JEE Main Application Correction
March 11-15, 2019
Admit Card availability
March 20, 2019
JEE Main Exam Dates 2019 (Computer Based Test)
April 7 to 20, 2019
Answer Key and OMR sheets
After April 21, 2019
Answer Key challenge acceptance
April last week, 2019
JEE Main Result Paper 1
April 30, 2019
JEE Main Result Paper 2
May 15, 2019
All India Ranks declaration
April 30, 2019

Good luck...

Hello Simmi,
Kindly visit the jee main official website once in day to know important notice regularly.

Official Jee main website:https://jeemain.nic.in/webinfo/Public/Home.aspx

To stay remain updated for jee main procedure, etc visit website atleast once a day.

If you have any questions remain than comment below.
Good luck...

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