Ok so you’re presumably already skipping breakfast doing 16/8. Try skipping lunch for a few weeks and just eat dinner. That gets easy fast. One week push your dinners later till nearer bedtime. Next skip a dinner and eat the next one - insta 48. I suggested pushing the meal back to nearer bedtime as it is mentally easier for me to skip so near to bedtime - I just go to bed.
I like doing this weekdays so I have dinner on Sun then 1 meal Tues and one meal Thurs. Its easy to mentally prepare for if you think youre already skipping 2 meals a day, 1 is the norm so why not skip that. There’s always the ‘I can eat tomorrow’ when the hunger kicks in.
This gradual build-up should help you get used to not eating. Take electrolytes is you feel keto flu or crappy in general during the fasts. Studying shouldnt be an issue if you build up to it.
The only way to get over it is to do it so you can see there’s nothing to be scared of. Sucks, but that’s how it is. We can tell you all kinds of things but you’re the one who has to experience it.
If you’re worried then I’d consider not working out or putting any other pressure on yourself. It’s going to be easier if you just focus on the one thing. Pick a time when you have fewer responsibilities and you can rest. This may be a weekend for example.
if you can do 38 hours you can do 48 hours it is more a mind game really
listen to your body if you can do it during a 2 day breakeven better, you may feel tired in that case go for a nap then carry on stay hydrated it tends to be around the 3 days mark when you may feel headaches/pains/anger and other stuff.