Just jump on it with all the free time do you have. You can do it!

get in the fuckin library and hunker down. College in one easy step.

List the subjects

Hi Rahul. I have this kind of thought a lot when I realize I have not prepared enough. The issue is that these thoughts can come at any stage in the process, whether you had 20 days or it's the beginning of the term. I remember rejecting coding in college because I knew people who had started in middle school. I felt foolish learning beginning programming in preparation for my masters' degree, regretfully thinking it was too late. It never really goes away.
I don't know what will help you, but I'll try to distill what helped me. When I was young, I had a mentality of "if I can't do it correctly, it isn't worth doing". When I was vulnerable and rethinking my path, this became co-opted by my dissenting inner voice. It presented rational arguments and I gave up before I started things. I lost relationships, friendships and career opportunities because it by the time I realized I cared, I thought that I could never overcome the difference. I still let it affect me, but it happens less now.
In your case, it's so rational to look at the next 20 days and think "I had all term to do this, I can't possibly make up the difference now." Maybe you can optimize the process, pick your highest-chance-to-pass classes, break those down, budget your time, and pass enough to be in this position next semester. That's probably the only thing that you can do right now. Maybe later, you can look inward and figure out why everything else is more preferable to you than studying. When I had a real, specific purpose for why I studied the things that I did, it informed my time management. I didn't find my purpose until after undergraduate, but my Masters' was easier than my bachelors' because my dissenting inner voice was exposed. It wasn't a rational helper - it was just an alternative viewpoint in my head that I gave too much space.
In your specific case, I think it's possible to pass. In Belgium (where I went to grad school), you generally have one text for each exam worth 75+% of your grade. Undergrads seem to do a large percentage of studying in the time after classes and before exams - 3-4 weeks or something. They literally would wake up, study, and sleep. It's possible, but I think it's way easier to find your purpose. Something else I wish I learned earlier - I thought it would be harder to find my purpose once I had already committed to something else. I have found it to be the opposite - I've re-found my purpose a few times, and it gets easier every time. If you've read this, thanks for reading and good luck.

yes it is possible but you need to be very careful about your next steps:

1. divide your subjects according to their difficulty and how much studying they need and literally grab a calendar and write down what are you studying each day for each subject. For example i would dedicate around 3 days for every subject and then revise and do practice exams. but you can adjust this according to your needs.

2. it is easily to get distracted and unmotivated cause of feelings. Exams are coming whether you like it or not so i would suggest you get real with yourself and formulate a plan and be disciplined in your studying whether you feel like it or not. Also i would recommend quality over quantity. use pomodoro technique and if you choose to only study 2-4 hours a day make sure you are efficient and there are no distractions around you (phone notifications, people interrupting your studying etc.) It takes 15 minutes for the brain to focus on a task and every time you interrupt the process with something different than what you re doing you lose in productivity as it plummets and it takes another 15 minutes to reach that level of concentration again. Now when it comes to motivation, remember why you re doing this. you re there to earn valuable skills, its an investment in yourself and your future. dont waste that. Easier said than done. i know.

Ex uni student who is now working but still struggles with studying.

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Good luck my friend. chin up and SMASH THEM

This is where the future doctors and engineers are separated from the rest. Go forth my child and let this trial by fire find you your place in the world.