Yeah, 100C is quite hot, but Haswell can handle the heat
Not that I would recommend leaving it there for extended periods though.
Personally, I try to keep my 4770K below 80C MAX in day-to-day usage.
As a broke student, take the relatively cool 80C MAX/Stress temps and run with it!
The 200MHz bump from 4.3GHz to 4.5GHz will add barely add a noticeable performance gain anyways...
Once you are done with your studies and have a little cash; or about a month before your planned upgrade;
then you can have some real fun overclocking your chip