Class 11

To prepare for JEE Mains, you first need to build strong concepts. For building strong concepts, you will need to master the basics first.
So, I will recommend you to first go for the NCERT Books. As you are in class 11th, you will have plenty of time to practice more and more questions. So, complete your 11th CBSE 1st. Practice as many questions from them.
Click on - https://www.eduncle.com/iit-jee to get more tips.
After that, move to books like HC Verma and RD Sharma, which are very good books to get a deeper knowledge and practice more questions.

Hello Saumya,
Never lose hope. Remember the proverb 'where there is will, there is way'. Start preparing immediately. Draw time table for study, cover each subject everyday, take mock test after some days, try a coaching institute for some weeks.
Best wishes.

Hello,
To prepare for JEE exam, you can take some help from the tips & tricks.
Make a fixed schedule
Make a list of books and notes and study material you want to prepare from.
Make a complete sight on:
https://scoop.eduncle.com/jee-advanced-syllabus
Mark the important topics and read them first. Ask your teachers if you get any doubt. Do prepare a list of formulas and basic concepts for quick revision. Solve previous year questions for practice.

You must study hard to be an astronaut. You must master in mathematics and physics, and also other subject. By the time India plans to send astronauts on mars, you can prepare very well. Spacex is likely to send manned mars mission by 2027 and NASA by 2030 or ahead. My personal advice: Choose Biology and mathematics, both as subject such that PCBM.

Hello Vineet Verma,
You need to prepare well for the engineering entrance test of IITs "Joint Entrance exam." The exam happens in two levels. The first one is JEE Mains which you have to give in 2019. After qualifying it, you become eligible to give JEE Advanced 2019.
If you successfully qualify both the levels, you can get admission in IIT based on your rank.