Hello aspirant,
I am here for helping you..

As per your doubt I am providing you a link below where you can see all about OJEE , about its Registration process , about some important dates and also about your doubt of downloading registration slip .
Link is given below:
https://engineering.careers360.com/articles/ojee-application-form
I hope it will be beneficial for you.....
For more queries you can upvote my answer and can ask in the comment section below...
Best of luck.....