MaxiV,
I wouldnt go wasting your time with anything IMC or CISI (lower than FSA level 4) - these are basically benchmark exams - plus, there are NO exemptions from CFA at any level from any other body which might be worth noting.
I know a few chaps who have completed the CFA exams in 18 month (started at the December level 1 stage), I also know people who have picked up the notes 5 weeks before the exam and passed (atleast that's what they told people) but these guys are usually the exeption to the rule - I'm currently a candidate, I'd say if you're thinking about it and have the time and have a natural and keen interest in financial markets then its certainly worth doing - the only problem is the volume and breadth of the learning involved. Difficult but not impossible at level 1.
http://www.investopedia.com/exam-guide/cfa-level-1/ethics-standards/
When you register for the exam you'll be given the CFAI books which are obviously very good if a little dry. The Notes are well worth getting but a little on the expensive side
http://www.schweser.com/cfa/cfa1.<a class="ktg6us78hf8vdu7" href="#">php</a>
You can usually get these off gumtree after june for knockdown prices.
Other cheaper providers include people like Allen Resources - the test database
CFA Exam Prep - Allen Resources cost $99 - direct questions (not much like the CFA actual) but good enough for learning prompts. you can jack it all off the web though... although this (as the CFAI will drill into you) is a "violation of standards".
Also note that no matter how long it takes you to pass all three stages you wont recevie your charter unless you know other charterholders and have had 3-4 years of <a class="ktg6us78hf8vdu7" href="#">investment</a> decision-making experience.
Hope this helps!