Michael Buckhoff is an ESL and English professor at California State University, San Bernardino. I came across his blog and website.

Michael says
I love teaching international students because they are so motivated to achieve success. Also, teaching these students enlightens me every time I step into the classroom.

He has listed 7 step system to improve  TOEFL iBT Score.

Step 1 – Learn English Vocabulary Skills to Super-Size Your Vocabulary

Step 2 – Learn English Pronunciation Skills to Target and Improve Your Pronunciation Weaknesses

Step 3 – Learn English Grammar Skills to Evaluate Your Grammar Competencies

Step 4 – Learn English Listening Skills to Analyze Your Listening Strengths and Weaknesses

Step 5 – Learn English Reading Skills to Develop Effective Reading Strategies

Step 6 – Learn English Writing Skills to Target and Improve Your Writing Weaknesses

Step 7 – Learn English Speaking Skills to Have an Organized Approach to Speaking