Well... Applying to the Hebrew University is quite easy.
You just need to enter this link and you'll be able to apply on-line to Israel's finest university (ranked amongst the 100 best Universities world wide!): https:www.huji.ac.il/dataj/controller/nirshamim/NIR-LOGIN?
Before you start applying to the Hebrew University, just answer yourself several question that would direct you towards the path that is best suited for you:
1.) Do you possess an Israel "Bagrut" and Psychometric entrance test score?
If so, you can check your acceptance probability to whatever you wish to major in at this link: http:/www.huji.ac.il/dataj/controller/getinfo/TLM-EXPECTEDREK
2.) If you have graduated in high school overseas (not in Israel you may contact the Hebrew University Office of overseas students Admission at this link:
http://info.huji.ac.il/ShowPage.asp?cat=216