Six months are enough for practice for JEE Main. If you want to crack your exam make sure you practice a lot. First, complete your syllabus and solve as many as questions releated to it. So, that you can do both the things side by side. Make sure your concepts are clear and you have strong fundamentals. Focus on the important topics you can solve MCQs for your practice. Refer previous year papers and mock test series for your practice. Give proper time to revision as well.

All the Best!!