SCERT Kerala published the new text books for First Year Higher Secondary (Plus One/+1) courses. Plus one have total 57 books in different categories. Some of them are optional categories. The Reference for the first & Second chapter available here till the text book distribution is completed.
Open the below link and refer the new syllabus for Higher Secondary Education First Year (Plus One/+1) for better comprehension.
Higher Secondary SCERT Plus One (+1) Text Books
Higher Secondary Plus One Text Books (All Subjects. Chapt 1 & 2)