should i skip engg maths or do imp topics!!

even at college i flunked through the classes of engg maths in the first 2 years i only liked doing probability but that to up till college level, its been more than an year i touched maths, should i skip it or do imp topics i have to start with revisions and pyqs and 3 core subjects are left till now!!

Please someone give me a list of topics to study i will use BS grewal book on higher engg maths cuz the lectures almost amount to 200+ hrs on maths alone and use YT to study things i get stuck in.

seniors who have studied from books i am in dire need of your help, i vaguely remember the topics i studied cuz i used that book to study for End sem exams as well, also if anybody can list out imp topics from engg maths subject it will be a great help!!

GATE CS