Paper 1 will be for B.E, B.Tech. and the mode of examination will computer-based only. According to the public notice, timing will be like your first shift exam will be from 9:30 am to 12:30 pm and the second shift will be from 2:30 to 5:30 pm
Paper 2 will be for B.Arch and B.Planning in which you will be having maths in part one and the second one will be for aptitude test and the third one for drawing, the whole exam will be computer-based except the drawing part.
Notice also says that the candidates can appear for both the examination, depending upon the course he/she wants to pursue.
JEE Main 2019 Complete Information: https://engineering.aglasem.com/jee-main-2019/
JEE Main 2019 Application Form: https://engineering.aglasem.com/jee-main-2019-application-form/