In order to complete 11th class syllabus in 1 month you can make your proper time -table according to your comfort and your strength and weakness.

It will help you to complete your syllabus on time. You can also set your daily and weekly targets.

Work on your basics to make your concepts clear and to build your fundamentals strong.  

Focus on the topics which carries more weightage in the exam.

Refer previous year papers to understand the exam and to know the level of the questions asked in the exam.

It is advisable to clear all your doubts. You can take help of teachers or you can join study groups. 

All the Best!!