Hello Bimala,

Follow these steps in order to effectively study for TOEFL:

• Start by getting to know the format of the test through either the official website of TOEFL or Madoosh. Magoosh is an excellent resource, it has multiple practice lesson videos and hundreds of practice questions.
• Find out why you are taking the test. For job, immigration, college or just self assessment. You will need to design your practice schedule accordingly. If it is for college you will have to try and get the best possible score.
• Have a score in mind so that you give the practice tests keeping that goal in mind. Once you check your practice test you will know what necessary improvements you need to make to your score in order to reach the goal you have set.
• Create ideal study place for taking the test. Ensure that the study place is quiet and comfortable. Make sure that you are able to pay attention in that space. Time your test sessions, take breaks if necessary beween different sections.
• Get a study guide in order to effective practice your abilities. For reading, underline and mark important points, take notes and check your answer with the answer key later. For listening take note so as you don't forget what the speakers are saying, get fmiliar with their accent. For writing, jot doen points and brain storm properly before you start writing. For speaking, answer the exact question which is being asked, keep it simple.
• Get help from a teacher or friend if necessary. Hire a tutor for effective results and evaluation.
• Read for thirty minutes everyday. Try reading non-technical english. Read story archives this has many stories from CNN for ESL learners, or read breaking news. Try summarizing and comprehending whatever you read. Reading will also help you improve your vacobulary.
• Practice listening to Englsh with your goal in mind. Try understanding and comprehending whatever you listen to into ideas, purpose, transitions, stresses and intonations. Listen to speeches given by people in order familiarize yourself with their accent.
• Practiced timed writing before the test. Give twenty-five minutes to each topic. During evaluation review your grammar and spelling errors, review sentence formation. Write in English everyday and take help from teachers or friends.
• Try speaking in English at all times. speak in English with others and ask them to correct at all time you make a mistake.
• Use active and passive learning strategies. First start studying with a goal in mind, this is active learning. Passive learning is when you learn through movies, speeches, books etc.
• Keep taking practice tests to test your progress. Keep a record of your progress and work for the goal you have set.
• Study for 2.5 to 3 hours regularly, everyday for the next three months in order to get a good score.

All the best!

I hope this helps!

Do revert back in case of any doubt.