Strategies for solving questions related to vectors and 3D geometry in the JEE Main exam:

1. Understand the concepts:
It is crucial to have a clear understanding of the basic concepts of vectors and 3D geometry. Ensure that you are familiar with vector operations, dot and cross products, equations of lines and planes, and concepts like direction cosines and direction ratios.

2. Master the formulas:
Memorize the important formulas related to vectors and 3D geometry. This includes formulas for distance between points, equation of a line in different forms, equation of a plane, and projections.

3. Practice visualization:
Develop your ability to visualize 3D structures and objects. This will help you in understanding and solving problems related to vectors and 3D geometry. Practice drawing diagrams and visualizing the given information.

4. Break down complex problems:
When encountering complex problems, break them down into smaller, more manageable parts. Identify what information is given and what is required. Try to simplify the problem by using vector techniques and converting it into a more familiar form.

5. Utilize properties and theorems:
Be familiar with the properties and theorems related to vectors and 3D geometry. This includes properties of dot and cross products, properties of lines and planes, and theorems like the distance formula and the condition for collinearity.

6. Solve previous year papers:
Practice solving previous year JEE Main papers and mock tests. This will help you become familiar with the types of questions asked and improve your problem-solving skills. Analyze your mistakes and work on strengthening your weak areas.

7. Time management:
Time management is crucial during the exam. Allocate a specific amount of time for each question and stick to it. If you encounter a difficult question, move on to the next one and come back to it later if time permits.

8. Revise and clarify doubts:
Regularly revise the concepts, formulas, and solved examples related to vectors and 3D geometry. If you have any doubts, clarify them from your teachers or refer to reliable study materials.

9. Solve additional practice problems:
Apart from solving previous year papers, solve additional practice problems from JEE Main preparation books or online platforms like EduRev. This will help you gain more exposure to different types of questions and improve your problem-solving skills.

Remember, consistent practice and a thorough understanding of the concepts are key to performing well in the mathematics section of the JEE Main exam.