Going from 100 to 180 in the Joint Entrance Examination is a tough feat that many want to achieve but only a few are able to. However, if you are totally determined, then you can easily reach to that level within 25 days of time. If you have already completed your 70% syllabus, then your target should be to compete the rest 30% in the next one week or 7 days, as we don't want to leave an easy scoring question just because you haven't studied the chapter.

The nest step should be to practice past year papers. JEE Main is known to repeat the previous papers a lot and you shouldn't leave these questions just because you haven't practised them. And in the nest step, you should just improve your practice and improve your time and accuracy as these are the only two things that matter in the exam.

Hope I have answered your question. All the best!