You said OD just to wake up in a psych ward. That tells me you don't want to die.
If you don't want to die then I suggest instead of making a scene with this psych-ward thing, you should just study your subjects, spend 30-40 minutes writing down the important information/studying, take a 5 minute 'break' where you read what you did and then repeat.
There's a lot of things you can do to help with depression if that's what you're dealing with, exercising would help but exercise means a lot of things. For your situation I would just recommend you do home workouts, the subreddit r/bodyweightfitness has some useful information on exercises you can do at home. I would also recommend changing your diet if it's bad, eat about 0.8g of protein per lb of body-weight, use a TDEE calculator to calculate your TDEE and eat a bit less or around your TDEE depending on if you're overweight/obese or not. Eat stuff like chicken, fish, vegetables, nuts and fruit, your gut biome also impacts your mental health so reducing sugars and processed food while taking probiotics and prebiotics like kefir will help as well
I would recommend you take a step back, look at your interests and posts you made on the internet and realise how cringey they are, your edgy 'I want to OD and be in a ward!' combined with that edgy 2000's pfp gives off a really immature and cringe image. For this I would recommend you try and leave this bit of you behind and imagine how embarrassed everyone irl would be if they knew what you post or have as a pfp on the internet, replace your old hobbies with new better ones (Music/songs replaced with studying or exercise) or simply remove them (I would recommend you not listen to music/songs and at best listen to instrumental music).
You are probably young, morally ok, average in physical and mental abilities, which isn't a bad thing, and in the first world- you should use this privilege you have to better yourself and help others if you can.
PS: Psych-wards are fucking terrible, I don't know why anyone would voluntarily put themselves in one