Hey Yaman! JEE Mains Paper 1 consists of 3 sections namely Physics, Chemistry and Mathematics whereas, Paper 2 has 3 sections- Aptitude Test, Mathematics and Drawing Test. Candidates can opt for one or both the papers of JEE Main. The duration of the exam is 3 hours. 4 marks will be awarded for every correct answer, while 1 mark will be deducted for every incorrect answer. Total there are 90 questions with each section comprising of 30 questions each.Hope this may help you. 

The JEE Main Paper 1 exam pattern will be a total of 90 questions each carrying 4 marks each with negative marking for every wrong answer. Paper 2 of JEE Main will have 82 questions, with different marking methodolgy for each section, the details of which are given in the link below

https://engineering.careers360.com/articles/jee-main-exam-pattern

You can download the official jee main 2018 syllabus ,link is given below

https://images.careers360.mobi/sites/default/files/JEE-Main-2018-Syllabus.pdf