Parallel parking, like any basic skill, is one that needs to be developed through practice. Just try to get as much practice as you can before taking the test.
At first be safely in the vehicle you drive. Then drive it as many times as you can before going for driving test. Know the rules to be followed while driving that vehicle.
Always line up your car with the one you are trying to park in front of, and always use both of your mirrors to be aware of your surroundings to the car in front, behind and the curb.
1-2feet away from the vehicle you're parallel parking onto. pull along side the vehicle,use blinker. it willbe your right blinker,since drive onthe rightside of the road.