Choose a study environment in which you feel comfortable studying and away from all kinds of distractions. Keep all your mobiles and laptops away from your study room.
Study effectively by dividing the study materials. Always keep a sheet of paper to make a note of important points, definitions, chemical reactions, and formulas.
Starting preparing for an exam a month before won't fetch you with good rank. So study on a regular basis by being regular in class.
Never ignore any topic, as every topic in your syllabus is important. Therefore, understand every concept, discuss it with your friends and reach your seniors or lecturers to solve your doubts.
Apart from other study material, refer to more NCERT textbooks for precise information. Most of the questions in CBSE exams are directly asked from these NCERT books.
Self-testing, and practicing CBSE sample papers and previous year's papers is the best way to prepare for the examinations. By solving them, a student can improve his/her preparation by allotting fixed time for each topic.
Revise all the important questions, make notes, and spend more time remembering and discussing the answers, formulas, equations, and more diagrams as they are very important in both theory and practical exams.
Try to finish the CBSE Class 9 syllabus one month before the exam as you will have enough time for revision and discussion. Never stress yourself and take proper diet, adequate amount of sleep and regular exercise for good health.