Hello,
If you are not able to open the links given in the lecture plan and you have not started preparing for JEE yet, begin with the basic textbooks you already have. Focus on understanding the main concepts in Physics, Chemistry, and Maths. Make a simple study plan and cover important chapters step by step. Use whatever study material is available to you without depending on the links. With regular practice and revision, you can start your preparation smoothly even without those resources.
Hope this helps you.

Hello,
If you are not able to access the links provided in the lecture plan and you have not prepared for JEE yet, start with the basic textbooks you already have. Focus on understanding fundamental concepts in Physics, Chemistry, and Maths. Build a simple study routine and cover the important topics step by step. Use any available study material or notes you can access without relying on the links. With regular study and practice, you can begin your preparation smoothly even without those resources.
Hope this helps you.