Life at an IIM
It's a tough question to answer - I do empathize with your current situation and I want you to come out of it too, but having gone through a phase like this, I am aware that only you can pull yourself out of it. I can share something if that helps -
Sometimes, we want to work hard, we are willing to and we know that once we get into the rhythm of working hard, we will be able to achieve our goal - we just are not able to start. And often, the reason is "being too difficult with yourself".
You must be going through a tough time, emotionally + mentally. Don't do you think you deserve to be kinder towards yourself? You said "I don't want to waste time", "It's hard to focus on studies" - you are trying to find a way out of it - that is in itself a step towards changing your current state. Take a moment to be proud of yourself for choosing to do that. We often end up not acknowledging our little efforts.
You must be having a target in your head for everything - a certain level of focus you want to achieve (maybe like you were able to earlier when your life seemed better). You want to not waste time - at all, maybe whatever you are doing right now feels like a burden - despite it not being studies, it feels like a pressure.
So, lower your expectations from yourself - it is not fair of you to expect so much from yourself while you are going through a hard time. Give yourself some break. Start slow. This is the kindest you can be towards yourself - take a small step.
Solve one RC, solve 10 questions of QA, just 10 (assuming here you are a CAT aspirant). You may think "how will I finish the syllabus, everyone will move ahead of me" - don't give a damn about them. You are fighting a battle inside first. Then, outside. If your inside is not strong rn, you need to take care of it first.
When you set a smaller goal, achieve it - you will feel that little joy in a day that may otherwise not be going well. That little joy will help you conclude that the day was a productive one, next day you will be more willing to increase the target yourself! That will be you working with yourself for yourself.
I am often too difficult with myself. I get so many comments/messages in the day that sometimes I feel bad about not being able to respond to each one of them. But, today, I am going to end my day thinking that I replied to your comment - and that is me telling myself that my day was productive. Even if I wasn't able to reply to so many others. We set targets for ourselves! No one does it for us.
Lower your standards at the moment and you will yourself want to raise the bar again when you're feeling better. Trust yourself!