Hi.Isn't the percentile marks out of 500 ? Can you please tell me what my marks would be out of 500 ?Thanks.

To calculate your marks out of 500 you need to consider your marks in the following subjects.
1. Physics
2. Chemistry
3. Mathematics
4. Any language
5. Any other subject
If you have taken more than 1 language, language with the higher marks wil be considered and if you have  more than 1 option for the 5th subject, subject with the higher marks will be considered.
So you can calculate your marks accordingly.

Ok.So according to you, I am in the top 20 percentile right ?Thanks for the reply.

Yes if your marks fall within the above mentioned criteria after calculation by what I've mentioned in the comment.

Here's the marks distribution,Physics-57/100 Chem-57/100 Math-69/100Eng-77/100 CS-167/200 & EVS-48/50Can you please tell me my score out of 500 ?Since CS is given out of 200.Thanks in advanced. 

sdf Bro can you tell me i have similar mark,how do you calculate marks out of 500? For JEE we need to calculate marks out of 500 or 600? Plz do reply

sdf Bro how did u calculate it i have same doubt now in 2020?