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Structural engineering is a branch of civil engineering that deals with the design and analysis of structures such as buildings, bridges, tunnels, towers, and other man-made structures. The goal of structural engineering is to ensure that the structures are safe, stable, and can withstand the stresses and loads they will experience during their lifespan. Structural engineers use their knowledge of Physics mechanics, materials Science, and mathematics to design structures that are strong, durable, and cost-effective. They analyze and calculate the forces that will ACT on a structure, such as gravity, wind, and earthquakes, and design the structure to resist these forces. In addition to designing structures, structural engineers also oversee their construction and ensure that they are built according to the design specifications. They work closely with architects, contractors, and other professionals involved in the construction process to ensure that the structure is built safely and efficiently.

JEE Mains and JEE Advanced are two different engineering entrance exams. JEE Mains is conducted just after 12th Boards in the month of April. Clearing Mains, you can get a rank and admission into the NITs (National Institute of Technology), IIITs, and various other colleges like Amity. Many private colleges admit students through the Mains score too. JEE Mains paper 1 has 90 MCQ Single Correct Option questions. 30 each from Maths, Physics and Chemistry. Marking Scheme is +4, -1. And full marks in 360. JEE Mains paper 2 is only for those interested in Architecture and is not for B.Tech admission, but B.Arch admissions. Clearing the cutoff in Mains paper 1 will make you eligible for JEE Advanced exam. Clearing JEE Advanced and getting a decent rank will land you in IITs. It is conducted in the month of May. JEE Advanced has 2 papers of 3 hours each. The full marks, marking scheme, question pattern everything varies every year (in 2016 full marks was 372 while in 2015 it was 504). The level of questions in JEE Advanced is higher than that of Mains and it has Multiple correct option type, integers, matrix and paragraph questions. JEE Mains tests your memory and basic concepts while Advanced tests your core concepts. Every year 12+ lac students appear for Mains and only 1.52 lac students qualify for Advanced. (Given that you are serious in your preparation, getting a decent rank in Mains and qualifying for Advanced is easy, so don't think that getting in top 2 lac will be difficult).
From the question, I assume that you are a school student. Good luck. Thank you.