Hello

Yes you can still view the answer key for the exam conducted in January. 

Herewith I'm giving you the link from which you can get your required answer key

https://engineering.careers360.com/articles/jee-main-answer-key

Thanks for contacting us.

Dear Ram, 

I think you are speaking about the medical career. Until now we don't have Neet as an online exam but we have AI IMS and j i p m e r as online test. In both of these exams you are allowed to Recheck the answer you have made and also if you want you can correct it and there is a another option for you to mark the questions that you want to do later.