As a tutor at my university's tutoring center, I can tell you that what I recommend to most of my tutees is to not just practice the problems (as if you were rushing through the problems really quickly), but to really take your time on the problems (really understand each step, each process, and connect the concepts from textbooks and their notes to better understand the problem). I've learned from my own experience that practice does not really mean "perfect" because a majority of the time, I would be remembering steps rather than understanding each of the steps to solving the problem.
I've tutored many subjects and they vary depending on how you work through the problem. For Physics, practicing drawing diagrams as well as understanding the meaning of the word problem are the most challenging aspects of studying (because each scenario is completely different from one another). For Organic Chemistry, I showed my tutees techniques to piecing molecules by understanding their chemical properties (for example, electronegativity), because there are many ways to make a molecule (which is why I've always encouraged them to not rely on me to give them the answer, but to connect the dots).
But of course for Chemical Engineering classes like Transport Phenomena, I've learned that solving the problems slowly (understanding boundary conditions, fluid properties, drawing out diagrams, setting up equations, and deriving them) and consistently (don't keep on switching your technique for solving a problem, stay consistent) are ways to get a hand on difficult problems.
Good luck on your finals everyone and I hope you all have a wonderful winter break!
I would suggest you divide your day into slots of 3 hrs and make it a habit to sit for the slot continuously. take a break at 1.5 hrs if you feel necessary. make a timetable and see that you study at least 2 subjects per day.
I also advise you to get the concepts, spend more time on understanding them and think of their applications. in case of equations try to use them as much as possible during solving sums etc., only this way u can remember the formulas etc., for a long time and memorizing them isn't a viable option.Hope this helps!With best wishes