Hello... I've taken all these classes (some of them were under different names at my university) and made A's in all of them (I've already graduated with a BS in biochem which requires all these classes). Here are some of my experiences, hope it'll help you prep for your pharm school application
From hardest to easiest (just my opinion)
1.Biochem: it's a combination of everything in science (cell, biol, math, chem, o-chem...) understand your basics (acid-bases pH, buffer, cell structures and physiology of biological processes, always follow the electrons when studying metabolism--where they go, which thing accepts and donates them, what enzymes transfer them). Use logics and try to understand things rather than memorizing (ex: enzyme kinetics, Cori cycle) Oh and remember to memorize all the amino acids carefully, trust me, you'll need them later... a lot
2. Molecular Biol: Again, this is similar to biochem because you need to know the basics but it emphasizes a lot on mechanisms in details: which step requires energy in which form, names of each enzyme/agent involving in each step...When studying these, draw out charts and follow the main events (eg: DNA strands finally get opened by a series of a bunch of stuffs binding to this and to this and to this...) Also, use logics to answer for ex why taking so much antibiotics make you tired, particularly reduces your ATP potentials
3.Immunology: Again, this clearly depends on the teacher. But be sure to know mechanisms (eg: how B/T cells kill, how their genes get rearranged...)
4. Genetics=Microbiol. To me they are the same, genetics is basically an intro to molecular biol. For micro, please make sure you are able to memorize names of bugs and know what they do, where they belong, how they are killed/supported (A lot of memorizing names)
5.O-chem: please make sure you understand mechanisms. That's all I can say. As long as you know how to push e- rationally and understand rxn steps, you are fine. Also, need to know how to memorize structures (just like with amino acids in biochem). This is a base for every single of your future classes in biol and biochem (med chem, pharmacology,...)
6.Physiology: I took this in 2 semesters sequence as Human A&P 1 and 2. For anotomy, you need to be a good memorizer. For physiology, you need to understand the process and know how the human body works (I know it's broad but make sure you know each step in each process of each system)
7.Cal=Physics. These are just maths. Cal requires some practice to solve stuffs like intergrals. For these two, the more practice you do with problems, the better shape you are in.
Good luck
For those that have taken these courses, how would you list them in order starting with the most difficult?
Genetics, Microbiology, Molecular Biology, Biochemistry, Immunology, Organic Chemistry, Physiology, Calculus, Physics?