• First of all be confident that you will be able to crack the exam next time with your hard work
• Revise all important topics first
• Make notes in the form of key points and formulas
• the paper level will be easier than jee main, so dont worry much
• Solve all last year question papers
• Refer Ncert books and have good grasp on concepts

Yes, it is possible but you should be determined and motivated to crack your exam. Make sure your concepts are clear.

You can also follow below strategies to crack your exam-

-Organic and Inorganic chemistry is very easy in CBSE board.It can be easily mugged up and increase your chances to score more.

-A proper study material is most needed for preparation,which cover up all your syllabus.

-Remember all the formulae and learn how to utilize them.

-The basic principles should be cleared make sure you have understood the concept.

-Don't go beyond the syllabus. Also, look again at those problems you studied on your own and look again does not mean literally to look, you have to work on those problems again to make sure that you have understood the concept

-Your 3 or 4 months preparation also depends on your understanding of 11th and 12th class

-Revision of the syllabus is very important; it ramps up your confidence and make you perfect.It should be started from last 15 days.

-Attempt a maximum number of previous years question papers.

-Solve at least five sample papers seriously considering it as JEE-Mains and MHT CET

-Passion for studying is the main key so don't lose it.Always remember the three C's when you are in trouble. Be cool, calm and confident