Doubt regarding preparation

I have finished 8 subjects as of now and the remaining are TOC, compiler design, CN and OS. I am thinking to complete the revision,pyqs and tests of the completed subjects now for 2 months and then study remaining 4 subjects in December. Is this a good idea? Or is it better to finish the whole syllabus before revising? I'm just looking for suggestions, and to know how you guys are going with it..