Hi

Which board are you from?

I am guessing you are from cbse board.

You can't get 2021 papers as board exams were cancelled due to covid

But yes,

You can get chemistry and other subjects 2020and other previous year papers at:-

https://school.careers360.com/cbse/cbse-previous-year-question-papers-class-12

Solving these papers will be very beneficial for you, it will help you to :-

------) know the pattern  of the examination.

------)  know the kind / types  of questions which are there in your  examination.

------)  it will give you an idea of the difficulty level  of  the examination .

------)  you  will get to know the important   topics  which  are  covered and asked often in the exam , so  that  you  can  accordingly plan for your examination.

------) it  will  help  you  to check and gauge your level  for  preparation for the examination,

------) it will let you  know  your areas or the topics you are weak at so that you can work on them  and   can  perform  even better in your examination.

------)  will   help you to improve your time management skills so that in your actual examination you can solve questions with better speed and accuracy .

Follow the given below tips to score well in your board examination :-

---------) Go well through your textbooks

---------) While reading the book, underline the important points and then later make short notes

---------) Do go through the questions at the end of the chapter, just reading is not going to help.

---------) Follow a routine, it should be such that it moves around 3 important things i. e first studying, then practicing questions and finally revision.

---------) Focus relatively more on your weak subject so that you can make them strong

---------) Have daily, weekly and monthly goals like you will complete these topics today , these chapter by the end of the week and these many chapters by the end of the month

---------) Be practical in your approach. For example, if you need 4 days to complete a chapter but you plan to finish it in 1 day from scratch then that's not going to help you, at  the end of the day it will give you disappointment and down your morale, so be practical.

---------) Complete your syllabus at least 1 month before your board examination so that you can give it for revision and practicing questions

---------) solve previous year question papers :- it will be really of great help to you because you will know what type of questions are asked in the exam, their difficulty level , examination pattern etc

---------) Go through chapterwise and unitwise test and once you're done with the complete syllabus ,go through full mock test papers. And do at least 5-10 full mock test papers in each subject.

---------) practicing days full mock test papers will let you know the level of your preparation for your board examination .

---------) after each mock test analyse your performance to know your mistakes / weak areas , after that you need to work on improving them in the subsequent mock tests .

I hope that you find this helpful.

Thank you