IELTS TIPS

To be honest, if your taking IELTS for general purpose, there is no difference between workshop vs. your own practice.

Here's why:
For Listening Test (the most difficult):
The most tricky part is understanding their accent (british). So I suggest that you subscribe (Free) to BBCWorldnews on-line and try to listen everyday to familiarize yourself with Brit accent. The speed for listening then understanding and your speed for writing important facts which will be played once. Being an english speaking and watching a lot of hollywood movies, i think you can create your own strategy to improve by practicing on your own.

For Reading,
I'm sure you can do this, because you have plenty of time to go back to the story and questions & vice versa. So, you don't need workshop on this, we have taken a lot of this type of exam like NCEE and university entrance exam.
For writing, try to practice by writing a letter like those in your sample exam before the actual exam, because "time" is your enemy

For Speaking,
DON'T Be NERVOUS!!!! relax and just be yourself to avoid mental block...Remember, what they want to check is whether you understand questions and you are capable of expressing your thoughts.....So try practicing by speaking in front of the mirror...Famous Questions Where did you came from? and please describe what type of place is your home.
So impress the examiner that you undertand his questions and you are giving her the best notion and best explanations....So don't be afraid...