Hello Aspirant,

JEE Main examination is conducted by NTA for the admissions to UG engineering programs offered by 31 NITs, IIEST Shibpur, 26 IIITs and 29 -Government Funded Technical Institutes (Other-GFTIs).

Of Course yes you can prepare for JEE MAIN with online course consider the course offered by careers360 in the link given below

https://learn.careers360.com/

GOOD LUCK!!

Hope it Helps,

there was good cources like ariharant publications this was the one of the links

https://arihantbooks.com/index.php?rt=content/content&content_id=25

https://docs.google.com/file/d/0B29NvzWOhSQyRHZqZjJwZ0hsRDA/edit

there are many more such are avilable  go with the first like 2017 jee paper will be avilable it will be a good method for preparing jee in last days was revison and practising the pre year papers all the best