Yes there will be negative marking in JEE Main Exam. The JEE Main Website mentions this clearly… It says “There will be objective type questions with four options having single correct answer. For each incorrect response, one fourth (1/4) of the total marks allotted to the question would be deducted. No deduction from the total score will, however, be made if no response is indicated for an item in the answer sheet.”
The candidates who are seeking admission in NITs, IIITs or CFTIs must ensure their eligibility for the admission in NITs, IIITs and CFTIs..
You can check out the Qualifying marks and the JEE Main Syllabus
To have an overview, click on the JEE Main Video
The number of attempts which a candidate can avail at JEE (Main) shall be limited to 03 (three) uniformly for all the candidates in consecutive years.