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Hi,
The answer cannot be a specific one.
Civil Engineering is not a single profession. A person who graduates as a Civil engineer has the ability to work in an incredibly large range of professions, such as, Traffic Design, Structural Engineering, Geotechnical Engineering, Bridge Engineering, Pre-cast Fabrication and Design, Civil Planning, Water & Waste Water Engineering, Industrial Engineering, and many more.
But to generalize how to become good in any of these, you need to know that no 2 projects are the same. You will always face new challenges, strange problems, and will have to come up with new solutions. To become good, you need to make sure to think out of the box, but in contrast, also never be afraid to ask and inquire from those who are more experienced and get fresh opinions from those who are less experienced.
Want to go beyond 'good' and aspire to be a great engineer? then use your first 5 years of work in the different departments of your field. Spend a couple of years in construction, a couple working in design, and top it off with working in site management. With the large scope of knowledge, and the overview of how the workflow goes from an idea to proposal to design to implementation and the management involved, you will:
Find your calling of where you belong in this workflow.
Have an edge that allows you to go beyond the narrow scope of a single position, and apply solutions to the bigger picture.
Hope this helps and best of luck with your career!

The required score in JEE Main to get admission in NIT for B.Tech varies every year and depends on various factors such as the number of applicants, difficulty level of the exam, and availability of seats. However, based on previous year's cutoffs, a general category candidate needs to score at least 90-95 percentile in JEE Main and a minimum of 99-100 marks (out of 300) to have a chance of getting admission in NITs for B.Tech. However, it's important to note that the cutoff score varies for different NITs and branches of B.Tech. Also, meeting the cutoff score does not guarantee admission as there are other factors that are taken into consideration such as the candidate's performance in the 12th board exam, availability of seats in the preferred branch, and other eligibility criteria. It is advisable to check the official website of JoSAA (Joint Seat Allocation Authority) for the latest cutoff scores and admission criteria for the NITs and other participating institutions. JoSAA conducts the counseling process and admission to NITs, IIITs, and GFTIs in India.

Basically, there are 3 sections in CAT exam - verbal ability, DILR, Quants.
Verbal ability-
Start reading newspaper daily to increase your reading speed and grasping power. Don't miss out the editorial page. Do proper analysis of articles on editorial page. Try to make summary of articles that you read para by para. However, reading newspaper won't be sufficient. Start solving RCs on a regular basis with proper analysis.
DILR-
This is one of the toughest section especially from previous 2-3 years. Not only it is tough but it also checks how quick your senses are and how good you are in selecting the sets. Therefore, the best thing to score in LR-DI is to practice more questions on daily basis so you understand which sets you should leave and before attempting the sets what are the things you should look for.
QUANTS-
This section is one of the most scoring section for student and you too should try to get maximum mark in this section. It has a proper syllabus and you need to practice each and every chapter. The major topics are- Geometry, Arithmetic, Algebra, Number System and Modern Math. It is basically the math that you have studied till tenth standard. However, having said that, the questions are not really easy. Focus more on Arithmetic and Algebra as these two are most important topics. Start with basics then go for intermediate.