Sudeepa_Kolli
Hi Kiara, what time of day are you most focused and attentive for learning? If you have less than a month before your test and your current score is far from your target score, I would recommend spending at least 15 hours a week preparing, during your most focused times, and attempting mock tests.
If this helps, for my TOEFL preparation, I scheduled 2 hours early in the morning three days a week and planned accordingly. Since Saturday was my test day, I would restructure my timetable based on my previous test scores, dedicating the most time to the section where I scored the lowest.