You need to focus on Algebra, Real Analysis, Complex Analysis, Integral Calculus, Differential Equations, Vector Calculus and Linear Programming at Graduation level. Please check the complete syllabus available at the official website https://cucetexam.in/CUCET2020/Document/Syllabus/Syllabus_PGQP27.pdf . You can also prepare from Model Test paper available at: https://cucetexam.in/CUCET2020/Document/SampleTestPaper/STP_PGQP27.pdf