There is no weightage of topics in exam. The WHOLE syllabus should be studied and prepared because it can come from anywhere in the syllabus. Here’s how the exam format is:
30 MCQs 2 marks each (from any area of syllabus) 16 MCQS 1 mark each (from any area of syllabus) 6 MTQs 4 marks each (1 MTQ from each section)
There’s no way you can predict which topics are to be tested. The best you can do is prepare and revise OT Lectures & Notes at least twice!