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Hello Sadiq,
The smart preparation is preparing in a way that gives you equal knowledge in PCM by spending an equal amount of time for each.
It is possible by allotting a time table which should be in such a way that you can manage your HSC as well as JEE Mains preparations.
Practice is really important when it comes to competitive exams. So, you need to practice as many problems as you can. Refer to the good books which may give you sufficient knowledge.
For concepts in PCM, NCERT would be ideal.
Physics -H. C. Verma volume 1&2
Chemistry- NCERT And O. P. Tandon
Maths - TMH (Tata Mcgraw hill) and Arihant series
The previous year questions would really help you in knowing the difficulty of JEE Mains as well as to improve your solving skills.
All the best.

The best travel jobs allow you to earn income while exploring the world.
First a little disclaimer. If all traveling jobs were easy, everyone would be doing this. Many of these professions require passion, specialized training, time commitment, and talent. For those that don't, the pay just isn't great.
There is no magic way to instantly make lots of money traveling.
some job options are- :
1) Travel Tour Guide
You could consider getting a job as a local tour guide or tour assistant for an international company, either at a single popular location or for larger multi-destination tours. Or you can think entrepreneurial and start your very own tours! Maybe its the best un-marked surf spots, an awesome local hiking trip, or showing people the coolest bars and restaurants in town.
2) Foreign Service
Working for the foreign service (aka diplomat) or an intergovernmental organization (IGO) is one travel job that allows you to experience life in a different part of the world. Most of these government jobs are only open to people with university degrees or knowledge of foreign languages. Indian foreign service by UPSC.
3) Teach English Abroad
Do you know how to speak English? You may not realize it, but professional English teachers are highly sought after around the world and the pay can be decent. However just understanding the language isn't enough, you generally need a college degree and a TEFL certification (Teaching English as a Foreign Language).
4) Travel Writer
Writing about travel seems to be a dream job for many, however its not something most people can just jump into. First, you have to be a great writer. Next, you need to learn about networking, pitching to editors, and all the other business stuff involved. Once you have those down, then its possible to write for magazines, newspapers, websites, or travel guidebooks. Copywriting and other types of writing are also options.
5) Work On A Yacht / Cruise Ship
Traveling the world while working on private yachts or large cruise ships is an awesome way to see some pretty exotic places. There are different types of positions available: deck-hand, stewardess, chef, tour manager, entertainment, engineer, and more.

To get into Sir J. J. School of Arts, Mumbai you need to work on your creative skills. The entrance exams will have subjects like Object Drawing Practical wherein a manmade/natural specimen will be provided to the candidate. He/She will have to draw a drawing of the specimen on the answer sheet as directed in the question paper. The question will be based to test the aptitude of candidate in drawing, proportions, rendering in pencil and overall observation.
Design Practical where the question will be based to test the aptitude of the candidate in the arrangement of various forms to create a good design in the given area, rendering in color, and the finishing skill. It will also have Memory Drawing Practical, Objective Type Theory.