Create MCQs for science for 7 th to 10 th standard for CBSE curriculum -- 2

I need freelancers who can create Multiple Choice Questions ( MCQs) for science for 7 th to 10 th standard for CBSE curriculum. MCQs should have a Hint and stepwise explanation along with the answer. All this will be in the prescribed format. I need MCQs with 4 different difficulty levels. Easy, Medium, Hard, and Harder. These MCQs are not going to be used for examination, They will be used for self-learning. All the MCQs will go into an educational product. A video of the product is attached herewith. The video is attached for a better understanding of the requirement of MCQs.