From the responses in the thread, we can see that it can be a bit difficult to speculate on some of the details of OP, beyond what s/he has already told us, and I don't have any problems with the idea of investing into bitcoin while a student and even using a seemingly pretty damned low amount that might not even be enough to make any kind of major and meaningful difference when it adds up to even a bit less than $10 per month - but at the same time, it is a good way to both practice and to learn about a topic in which you are interested, since many of us longer term bitcoin investors likely realize that we are able to pay much more attention to bitcoin and to even learn about bitcoin when we are taking a stake into it by regularly investing into it.
Many of the posters here are correct in terms of the fact that students do not tend to have a lot of extra money to invest into anything, and so we likely need to take OP's word (and representation) regarding how much s/he believes to be a prudent and reasonable amount to invest into bitcoin based on current cashflow that accounts for expenses.
For sure, I was not sure of OP's expectation that BTC may well reach $100k by 2025, and surely none of us know, even though we likely realize that $100k seems to be fairly easily within expectations, but at the same time, many of us will come to differing conclusions in regards to how we plan to manage our BTC stash in the coming couple of years, even if we may well be expecting the BTC price to have good chances of quadrupling in that time... and some of us have gone through much greater BTC prices rises than 4x and we still hang onto our coins and we may well have continued to accumulate during decently high rises in BTC prices.
On a personal level, I don't tend to recommend selling any BTC until reaching high levels of accumulation, and I also tend to believe that it takes a decently long time to build any investment portfolio, and it can be quite problematic to be attempting to trade swings within various cycles that any asset class might have, including if we might presume that BTC might be OPs only investment between now and 2025... BTC and his local currency (or perhaps dollars or some other form of fiat-pegged currency(ies)?)
Also, I have no problem to NOT diversify and ONLY focus on one (Bitcoin in this case) (or perhaps more than one) investment asset during the period in which a person is first building his/her investment portfolio, and really I cannot be sure about how much income OP might be expecting to get, but for me, it can be difficult to imagine how to measure exactly would be a meaningful size for an investment portfolio without having some kind of an idea regarding the size of OP's expected post graduation income, and I doubt that any of us need to know the size of the income, but frequently we still might well be able to measure if the size of our investment portfolio might start to be getting large if we can measure it in terms of how much we believe that it will cost us to live each year (which sometimes can be partially reflected in the size of an expected annual income). So in that regard, if any of us is starting to get our investment portfolio up to the size of one year's income, then we are likely starting to get to meaningful amounts, and if we start to get to the size of 20x to 30x the size of our expected annual income (or how much we believe that we need to live comfortably), then we are starting to get to entry-level fuck you status...
....and surely if we are young, then we likely want to continue to earn income because we might not feel comfortable retiring when we have to be able to live off of our investment portfolio, but surely a person who might expect to potentially have to live off of their investment portfolio for 20-30 years, then they may well feel o.k. with going into fuck you status with 20x to 30x their expected annual income size into an investment portfolio and then expect to draw around 4% per year from their investment portfolio and expect their investment portfolio to continue to grow by at least 4% per year.. and that may all work as long as inflation stays under control... which surely we know that inflation varies from country to country, but inflation also varies depending on what is going on in the world at the time that we might be considering going into some kind of a status in which we are expecting to live off of the mostly passive income of our investment portfolio.