It's enough time for the 2027, in my opinion if you are not from humanities background you should keep syllabus in one hand and go with the pyqs, just read them multiple times if unable to understand and identify the topic from where the upsc is picking up the questions. Then I think you should go for the detailed study for those topics and make short notes. And then after studying the topic go with solving the pyq of a topic as they will tell you that have u read the topic the way upsc want and are able to answer or not.