Most riders can handle the first corner. It's the second or third that takes them dangerously off line.
The trick is to think at least one corner past the one you're approaching.
Remember, the best exit line from corner No. 1 isn't necessarily the best entry line for corner No. 2. Be quick to adjust your path to be in optimal position for the next turn.
Plan ahead. Scan the turns as far as you can see. Register information about how each sets up. Maybe the first corner is tight, the second is a sweeper and the third is a downhill switchback. With experience, you can "imprint" a sequence in your mind to help your body guide the bike. Then you'll be flowing instead of dealing with each new corner individually.
Practice in safe conditions. Set paper cups in a slightly sloping parking lot to form various three- or four-turn combinations. Master one pattern, then rearrange the cups. Notice that the fastest line through a turn may not be the best line. It depends on what's next.
Bleed your speed. Don't try to set land speed records in consecutive turns. The goal is to get through them safely, smoothly and with a degree of elegance -- while staying out of the bushes!
Source: RBR