Four days is PLENTY of time to study for your final. I know that being comprehensive makes the test intimidating, but if you put 40 hours into studying for the exam, you may get by with a decent grade.
For my organic chemistry 1 final (which I took last week and did well on) my steps were as follows:
1. Organize the information into categories. (What types of reaction are there? Which conditions affect the reaction?) I drew grids to organize this information in my head. On the exam I literally filled up the margins with all of these grids that I had memorized.
2. Memorize all of the key data which allows you to manipulate the reactions and conditions mentioned above. Are you expected to know pka values? Memorize them! Do you need to know what is a good nucleophile vs. a good leaving group? If you answer is yes, then memorize the trends with arrows on the periodic table and draw this from memory on the margin of your exam! Do you need to know common protic or aprotic solvents? If so, then emorize them! Do you need to know common IR or NMR features and ranges? If you do, then memorize them!
3. Work as many problems as you can and have a plan of attack. For example, I would force myself to do all of the chapter 12 problems the prof had recommended for practice, then take a break to eat. Then, I would do all of our practice workshop problems then watch something relaxing. Taking breaks is critical to allow the information you've processed to sink in, and it rewards you for achieving each goal you set for yourself. When you break up your study sessions into discrete and quantified sections with clear goals, you'll see that it's not quite as insurmountable a task as you had first believed.
Do everything you can NOT to fail first.
PS- Ignore Mike, he knows just about nothing beyond logging in and trolling threads on SDN. I shadowed a periodontist who failed orgo. When I got to talking with him about orgo his response was "I use that stuff all the time...." My skeptical response: "Really?" His answer: "No."
