Both TS EAMCET and AP EAMCET are very versatile entrances. I would say it may not have similar kind of hardness compared to JEE MAINS but it don't follow a fixed pattern every year. Thus if you want to do well in this exam, its highly recommended for you to do both 11 and 12 syllabus sincerely and don't depend on any such probabilistic entities. Although as per the last 3 years pattern 60% of question are frequently asked from 12 and 40% of questions are asked from 11. This order may change so its better to study both the parts with equal importance.

To know more about TS EAMCET visit the link below:

https://engineering.careers360.com/articles/ts-eamcet

To know more about AP EAMCET visit the link below:

https://engineering.careers360.com/articles/ap-eamcet

I hope this answer helps. All the very best for your future endeavors!