Level up your driving skill quickly
Okay on the first island (Los Muertos) drive out of the agency building in any of the agency cars (supercar is usually the easiest to control) and as soon as you get onto the main road there will be quite a few gang members, simply keep running them over and run over nay new gang members that come along. Eventually hit squads will arrive so you will have loads of gang members to hit. Just keep runnig them over and when your car has taken a lot of damage simply go back to the agency garage and replace it. Wash, rinse and repeat. You should be able to max out your driving skill in under an hour this way.
Hope this helps
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