I want to learn English well

Last week I taked(took)\take-took-taken\ part in an English test, the College English Test 6.In China,this test is very importan(t) for college students to seek for job in the future and it's a certification of your skills.But I almost can't understand the part of listening comprehension at all. The speakers said(were talking) so quickly that I don't didn't know what they spoke(were saying) to each other. I known this time I can't pass the exam,either. What's worse,when I wrote the composition,I don't(didn't) konw how to spell lots of words,so I could(n)'t write any more.When the test was over,I felt so badly.I really want to learn English well.