JEE Main 2015 Answer Key by Sri Chaitanya was issued few hours after the exam, on their official website. It contains solutions to the questions in the exam. From it, you can estimate your scores. To do so, first you must download the answer for the correct paper set.
For both, Paper-1 and Paper-2, there are four sets. Each set has a unique code given to it. The code for Paper-1 are E, F, G, H. Whereas, for Paper-2 the codes are K, L, M and N. Candidates must pay attention to the code, while downloading the key. When candidates will have the appropriate key, they are supposed to cross-check answers in it, with the answers marked.
While checking the answers, allocate the marks according to the marking scheme. For each correct answer, allocate 4 marks, however, for each incorrect answer deduct 1/4 marks as negative marking. When the entire allocating and deducting procedure will end, candidate will be left with their estimated scores.
JEE Main 2015 other Coaching institute Answer key
JEE Main 2015 is also scheduled on 10 and 11 April 2015. After the conclusion of the examination, CBSE will issue the official answer key, on 18 April 2015. It will be issued online, on the official website of the exam. Candidates will be able to access it till 22 April 2015. Provision to challenge it will be given against submitting written application and DD of Rs. 500 (per question). The official scores will be released on 27 April 2015 and the AIR will be released on 7 July 2015.