hi , I have just given my class 11 exams and my 12 will start from 1 April , am preparing for iitjee and my 11th got wasted due to some reasons,I have bought a batch on competishun, I have backlog there too due to school exams, please guide what should Ido,how should I manage 12+11 simultaneously

Hello aspirant,
You are left with almost one year for JEE exam. In order to qualify for JEE Advanced you need to first clear JEE Mains entrance exam.
---->>You can take online or offline coaching or can study by yourself. You can study for around minimum 6 to 8 hours in a day depending on your comfort and convenience. We can't expect how much score you get but if you have proper time table and strategy then you can score well in the examination.
Preparation Tips for JEE Mains entrance exam:
**First go through JEE Mains syllabus and make a note of it.
**Go through previous years question papers for knowing the model of questions asked in the examination.
**First prepare the topics you feel easy, to boost up your confidence.
**Prepare your own short notes.
**Make flow chart of the concepts to remember them easily.
**After than go for tough subjects prepration.
**Regular revision is necessary after completion of every topic.
**After completion of the syllabus preparation then solve previous year's papers.
**Then go for sample papers solving.
**Take sample or practice tests/ mock tests/ online test series to check upto what mark you are with the concepts.
**Finally revise all the syllabus.
To get more information about JEE Mains 2023 Syllabus go through below mentioned link.
https://engineering.careers360.com/articles/jee-main-2023/amp
I'm providing you with the information about best Books for preparation of JEE Mains exam which are listed below.
Physics:

• NCERT Physics Class XI & Class XII
• Objective Physics by D.C Pandey
• Concepts of Physics by H.C. Verma
• Fundamentals of Physics by Halliday, Resnick and Walker

Chemistry:

• NCERT Chemistry textbooks for Class XI and XII
• ABC of Chemistry for Classes 11 and 12 by Modern
• Concise Inorganic Chemistry by J.D.Lee
• Complete NEET Guide: Physics by MTG Editorial Board
• Physical Chemistry by OP Tandon
• Organic Chemistry by Himanshu Pandey

Mathematics:

• Objective Mathematics by R.D. Sharma
• Mathematics by Arihant Publications
• NCERT 11 th standard Mathematics Text book
• NCERT 12 th standard Mathematics Text book

For more information about Best Books for JEE Mains can be available in below mentioned article.
https://engineering.careers360.com/articles/best-books-for-jee-main
To get information about JEE Advanced preparation books ho through below given link.
https://engineering.careers360.com/articles/best-books-for-jee-advanced
You can check below mentioned link to get more information about JEE Mains Knockout, as they provide study materials, mock tests, etc.
https://learn.careers360.com/knockout-jee-main-april/
I hope this information helps you.
Good Luck!!