Probability and Statistics might get a bit time confusing if you are weak at either logic building or calculations. Work on both of these aspects if you wish to improve your overall score in GATE ECE Entrance Exam.
Numerical Computation and Estimation will be primary in this section of GATE Electronics and Communication Engineering Test. Solve these practice papers and develop a regular test habit to learn and improve on a daily basis.
Linear algebra is the branch of mathematics concerning vector spaces and linear mappings between such spaces. GATE ECE might have a bunch of questions from Linear Algebra under Engineering Mathematics so do give those a try.