how to i prepare for class 9 exam and score good marks in class 9
The best thing that you can do is that to attend the classes regularly. At this point the subject such as Mathematics and Sciences such as Physics, Chemistry or Biology are very crucial as these subjects form the very basis of your higher education.
Attend classes, solve all the papers of previous years, stay fit and don't forget your goal and you'll do just great for your age and class.
Hope I have answered your question. All the best!