No one can write as fast as a lecturer can talk, so you must take down only part of what is said. Abbreviations will help you take down more. If some words are used often in your class, just invent a short abbreviation - SH for Shakespeare, FG or federal government, or E for economics. Don't cram your notes together. Leave blank spaces in case the lecturer goes back to a previous point to add information.
Spacious notes are easy to study from.