Hello, I am close to you in situations, I scored 38 in gate 2017 with coaching. Where I mistaken was not reading from standard books, and just reading materials and watching videos, and always trying shortcut for every long process, instead of speeding up and learning.
What I am gonna do is, to take up a job which doesn't eat up my entire day, so I can prepare for gate '18 alongside. I will be buying all reference books and will start from there. Also, now I know my weak areas in a subject, so in fact, we(repeaters) can prepare better. I will build strong revision plans with minimum 3 time full syllabus revision. As I am starting studying again from May, all I am feeling is lost. Do I know this or skip this...? But I am well determined that I didn't chose gate for just TRYING, it was for a purpose and I need to remember and trust it again!
In my opinion, videos are helpful, but books have ultimate impact on us as we all are somewhat habituated to learn from it. For subjects like engineering maths and digital, we can skip books. All the best.