The XRP,Waves,ICN and Pillar is worth to invest with but if you've got short bugdgeted guy since you are a student then you can also do some bounty jobs so that you can earn while waiting for your investment to grow for long period of time. But make sure that you are around since their are some certain flaws on its flactuations so that you doesn't miss those profit earning times when pump comes on them.

Trading = Buying and selling Cryptocurrency such as BTC, ETH, SC, ZCash and many many more.
It means that you'll buy BTC for example at the price of $2000, save it till you see a price increase and sell it for profit at $2300 when price has increased. Same goes for all the other coins. Bitcoin is the "Main" Cryptocurrency in simple words, the others are called Altcoins, Ethereum, Monero, ZCash and many more, in simple words, "Alternative" coins might be a good word to use.
Have a look at this website to check popular coins and their price chart history to get the basic concept.
https://coinmarketcap.com/

While there is still time that bitcoin isn't reaching to $10,000 I suggest just go invest in bitcoin. Buy bitcoins now and while you are studying you don't have to manage it daily, because the basic thing you need to do is to hold bitcoins. And you can now study and focus with it while your investment in bitcoin is running passively.

The XRP,Waves,ICN and Pillar is worth to invest with but if you've got short bugdgeted guy since you are a student then you can also do some bounty jobs so that you can earn while waiting for your investment to grow for long period of time. But make sure that you are around since their are some certain flaws on its flactuations so that you doesn't miss those profit earning times when pump comes on them.

Depends on where you want to invest in, if you do invest in altcoins, they can rapidly go up netting you heaps of profit. With 250, you could get at least 0.1 Bitcoin. That isn't much but it is enough to start.

From then on you can start posting here and leveling up your account or offering your services to make a bit of bitcoin on the side. If you know photoshop, code, graphic design, or have other skills that you think people will need you can start posting your service on "services" and then start to build up your Bitcoin.

4 years ago, I was a student like you, and I'm doing 2 jobs just to have my education going plus my daily expenses as well. I'm making good money, more than enough for school and daily life. The thing is, there isn't much to spend the spare one so I just go and buy whatever the hell I want. If only I knew bitcoin back then, I would have been a millionaire by now since I was able to save $300 a month and have my expenses paid. The thing is, there is never a good time to invest; you just need to be wise on what to invest on. That $250 might not be a big sum today but give it a few years and you will be one of the luckiest people who took the risk and opportunity of buying the investment of your lifetime.

Depends on where you want to invest, you could invest into trading, buying BTC or Altcoins and then trying to sell them at a higher price, buying GPUs/Rigs for mining could also be one investment, not sure if I'd recommend that, If Bitcoin price dumps, I'm in a bad position after investing in GPU parts etc.
Anyway, I don't have much knowledge on trading, but what I would suggest you is to not invest all your money into one coin, if that coin's price drops, you are pretty much doomed.
You could try investing small amounts of money here and there and see how it goes till you obtain the basic knowledge on how trading works.
No one can really speculate the price of Bitcoin or any other coin, I'd advise you to be extremely critical when reading any speculations, could turn out bad if they don't go as expected.