The chapters on 3D geometry and vectors are important and have a good weightage in the JEE exams:

JEE Main: 3D geometry and vectors contribute 15% to the syllabus. These chapters require a strong understanding of spatial reasoning and vector operations.

JEE Advanced: Vector and 3D has an 11% weightage in the JEE Advanced syllabus.

IIT JEE Mathematics: Vectors are considered an important topic and are similar in weightage to coordinate geometry.

You should go for NCERT solutions for 3d