how many questions I have to attempt to score around 155 marks in iitjee

Hello Aspirant,

As one question is of 4 marks in JEE-Main so  you have to attempt at least 39 questions correctly in order to secure 155+ marks in JEE-Main 2021 provided that you do not attempt any incorrect answer otherwise negative marking of 1 will also be rewarded on wrong attempts. So attempt only those question for which you are confident.

Now If we go through the analysis of marks Vs Percentile Vs rank for JEE-Main 2020 then according to such marks your percentile and rank are expected to be in the range of 97.56 - 98.62 and 10,000-15,000 respectively.

You can check out marks Vs ranks Vs Percentile from the link given below :-

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

Or

You can also use JEE-Main Rank Predictor to predict your rank :-

JEE Main Rank Predictor 2021 - Predict your JEE Main 2021 Rank, JEE Main Percentile Calculator

JEE Main Rank Predictor - Know your expected IIT JEE Main 2021 Rank by using Careers360 JEE Main rank predictor tool based on JEE Mains scor ...

Note that the percentile and rank which are predicted is only the expected percentile and rank on the basis of previous year's data so your actual percentile  and rank might vary depending upon current factors.

To have a list of all those colleges which you can get based upon your marks, category, and state you can use JEE-Main College Predictor:-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

If you are preparing for JEE-Main 2021 (remaining attempt) or 2022 then I would recommend you to check the resources made by our experts to help aspirants like you in the best and smart preparation of JEE-Main 2021 or 2022 :-

https://learn.careers360.com/jee-main-coaching/?utm_source=%20QnA

I hope this information helps you.

Good Luck!!