Hello Varsha,

NTA will release the official answer key of JEE Main 2019 in online mode for both Paper 1 and Paper 2.  JEE Main January attempt exam answer key had already been released by NTA. The final answer key of JEE Main Paper-2 was released on January 31 in which two questions from the forenoon shifts were dropped and awarded full marks. Earlier, JEE Main 2019 Paper- 1 official answer key for January session was released January 23. Total of 22 questions have been dropped and the candidates have been awarded full marks for the same. The result for Paper-1 for January session was declared on January 19. 

For more details please visit - https://engineering.careers360.com/articles/jee-main-official-answer-key

Hope this helps.