Hello Tanmaya

To calculate JEE Main marks using the official answer keys of JEE Main 2019, you have to follow the given below steps:

1. Download the JEE Main 2019 official answer keys from the website.
2. Compare your recorded responses to the answer keys given by NTA.
3. Refer to the marking scheme of JEE Main 2019 to calculate your expected score.
4. According to JEE Main marking scheme, for every correct response, a candidate will be awarded 4 marks, while 1 mark will be deducted for any question answered incorrectly. No marks will be awarded or deducted for un-attempted questions. All you have to do is apply the formula below:

(Total number of correct answers X 4) – (Total number of incorrect responses X 1) = Expected score in JEE Main 2019 .

5. The total mark calculated would be your probable JEE Main 2019 score.

Hope this helps you