Its urgent!! Psl help with this mysql!!!!!

[Drazer]

Hey Guys 2moro is my Mysql Exam and Im not familiar with Ubuntu.....
My Queries are
1) How To Start Mysql Like It shows "MySql>"
2) My sql service is Started but when I give command

root@drazer-GA-MA785GM-US2H:/home/drazer# service mysql start
start: Job is already running: mysql
root@drazer-GA-MA785GM-US2H:/home/drazer# mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
root@drazer-GA-MA785GM-US2H:/home/drazer# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
root@drazer-GA-MA785GM-US2H:/home/drazer#

How To solve This ...???
PLS HELP.....:(

[Bodsda]

... You'll need to use the correct password

Note that the MySQL root password may not be the same as your system root password