Hello,

You should wait out for the official notification regarding CUCET to know exact details regarding the exam pattern, last  year many universities were to accept admission based on CUCET scores which didn't happen, as of now only the only confirmation is for Delhi University and JNU to be taking admission for undergraduate and post graduate courses through CUCET scores, read out full story at https://news.careers360.com/after-du-jnu-decides-on-cucet-for-admission-from-academic-year-jawaharlal-nehru-university

the syllabus of the ug admission will definitely be based on 10+2 level only, in order to avoid the confusion please wait out for the official notification for the same, also you will have sufficient time to prepare for the exam.