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KEA is the competent authority for KCET, and after successfully conducting the exam the official release the answer key at kea.kar.nic.in , candidates can visit this site to download the official answer key of KCET 2021, since you enquired about answer keys of KCET 2020 pertaining to physics, maths, and chemistry, you can visit our page  at https://engineering.careers360.com/articles/kcet-answer-key to know more details regarding this.