Improving your understanding and performance in physics and chemistry requires patience, consistent effort, and effective study strategies. Here are some steps you can take to gradually build your knowledge and confidence in these subjects:

1. Assess Your Current Level: Start by identifying the specific topics or concepts that you find challenging. This will help you create a focused plan to address your weaknesses.

2. Set Realistic Goals: Set achievable goals for yourself. These could be short-term goals like understanding a particular concept or completing a certain number of practice problems.

3. Start with Basics: If your foundation is weak, begin with the fundamental concepts. Understand the basic principles before moving on to more complex topics.

4. Break Down Topics: Divide each subject into smaller topics or units. This makes studying more manageable and allows you to focus on one concept at a time.

5. Use Reliable Resources: Choose textbooks, online tutorials, videos, and educational websites that explain concepts clearly. Consult multiple sources to get different perspectives.

6. Practice Regularly: Both physics and chemistry require practice. Solve plenty of problems and exercises to reinforce your understanding. Many textbooks offer practice questions and problems at the end of each chapter.

7. Work on Examples: Study solved examples to understand problem-solving strategies and the application of concepts.

8. Take Notes: While studying, take concise notes that highlight key concepts, formulas, and explanations. This will help you review and revise later.