How do I prepare for the upcoming Midterm Exam in Organic Chemistry 202, which is approaching in 10 days, while also maintaining a part-time data entry job that requires 20 hours of work per week?

I'm a junior, majoring in Bioengineering, and I've already fallen behind in Organic Chemistry 202 due to a family emergency in January. To catch up, I've been studying for 4-6 hours each day for the past two weeks, but I'm still struggling to understand the reaction mechanisms, particularly for the nucleophilic substitution reactions. My professor, Dr. Lee, requires us to memorize and apply these mechanisms to solve complex problems, but I need to know how to effectively utilize my study materials and time to boost my exam scores within this tight deadline.