COMEDK is based on the existing syllabus of 11th and 12th of Physics, Chemistry and Mathematics. The official brochure https://www.comedk.org/wp-content/uploads/2020/01/COMEDK-2020-INFORMATION-BROCHURE-UGET-EXAM.pdf doesn't mention any omission of any topics per se. So you have to read all the Physics, Chemistry and Mathematics of 11th and 12th. We cannot vouch for what is written in other websites but because there is no official information about this, we would suggest you to cover all the topics and Chapters.