Students can appear for both exams as best of both attempts shall be considered . Registration for april attemlt shall begin in February and hence will be different date feom January attempts .

All latest announcements below. 

https://www.thestatesman.com/india/jee-main-examination-2019-online-registration-end-tomorrow-apply-now-jeemain-nic-1502690666.html

Hello Pranav,

Yes, you can apply for JEE Main 2019 April exam from 8th February 2019 to 7th March 2019.

For more information, you may visit the link given below

https://engineering.careers360.com/exams/jee-main

Thanks for query

All the best for your examination.

Hi pranav ,

From 2019 jee will be conducted twice in January and in April 

Form filling for 2nd tier exam will be start from 2nd week of Feb2019 to last week of Feb 2019.

You can register for April month.

Best wishes...