Keep ready your Registration number of JEE MAIN 2013, you need to submit this number to obtain your of JEE MAIN 2013 score and All India Rank (AIR). To check your result of JEE MAIN 2013 click here. On clicking the link you will be redirected to http://jeemain.nic.in.
If the website is down you can call the helpline to know the result.
The helplines numbers are- Helpline No.: 8527557482, 8527557572, 9717182698, 9717182594, 9910802727
Remember that this result is not for the admission in IITs. To take admission in IIT you need to appear in JEE Advance 2013. You can appear in JEE Advance only if you are in top 1,50,000 rank .
Best of luck. (Wait till 4 pm of 07th may 2013 for result)