Yes, your marks in Plus One (Class 11)  will affect your rank in KEAM, JEE, and potentially CUET (depending on the university) as these exams consider both Class 11 and Class 12 marks for the final ranking in Kerala.

For KEAM, weightage is given to both Class 11 and Class 12 marks (typically equal weightage of 50% each) for the final rank calculation in Engineering entrance.

JEE Main considers only Class 12 board marks for the ranking. However, some IITs might include Class 11 marks as part of their criteria for shortlisting candidates for the JEE Advanced entrance exam.

The weightage given to Class 11 and 12 marks for CUET ranking can vary depending on the university you're applying to. Some universities might consider only Class 12, while others might include Class 11 marks as well. It's crucial to check the specific admission criteria of the universities you're interested in through CUET.

I hope it helps!