To get 300 marks in biology, you need to follow a systematic approach. Here are some tips that can help you achieve your goal:

1. Understand the Syllabus: The first step towards scoring good marks in biology is to understand the syllabus. You should know what topics are covered in the syllabus and what weightage each topic carries.

2. Make a Study Plan: Once you have understood the syllabus, make a study plan. Divide the topics into smaller sections and allocate time for each section. Make sure you cover all the topics before the exam.

3. Use Good Study Material: Choose good study material that covers all the topics in the syllabus. You can use textbooks, reference books, or online resources.

4. Focus on Concepts: Biology is a subject that requires a good understanding of concepts. You should focus on understanding the concepts rather than just memorizing the facts.

5. Practice Diagrams: Biology involves a lot of diagrams. You should practice drawing diagrams and labeling them properly. This will help you score good marks in the exams.

6. Solve Previous Year Question Papers: Solving previous year question papers will give you an idea of the exam pattern and the type of questions asked in the exams.

7. Attend Classes Regularly: Attending classes regularly is important as you can clear your doubts and get a better understanding of the concepts.

8. Revise Regularly: Revision is the key to success in biology. You should revise the topics regularly to ensure that you have a good grasp of the concepts.

9. Practice Time Management: During the exam, you should manage your time effectively. Allocate time for each section and try to complete the exam within the given time.

In conclusion, getting 300 marks in biology requires consistent effort and dedication. Follow the above tips, and you are sure to achieve your goal.

Read one book 10 times rather than read 10 books it means main focus on ncert language line to line after reading one chapter take break then do mcq of that chapter