I got As in OChem 1 and 2, and I'm now a TA for OChem1 (the prof selected 2 students so I got super lucky)
1) What many hours did you put into studying a week for just ochem?
Personally, less is more (for ME). I don't go over 1 hour a day--it's just not productive, and if you're banging your head against a wall not understanding something, this is very demoralizing. Study for how long you need to study, and don't exceed an hour if you can help it. Break down your studying into a schedule. For me, I'd have around 10-15 mins review from last lecture's material (skim over notes, practice problems, generate questions for office hours etc), 20-35 mins reading over NEXT lecture's material (this is the important part, TAKE YOUR DAMN TIME AND READ THE CHAPTER, SLOWLY AND INTERNALIZE) DO. NOT. SKIM. And spend the remaining time (around 10-20 mins) doing practice problems and generating questions.
Take my word for it: you need to learn ACTIVELY. Reading the material does not help if you don't INTERNALIZE it. You have to read and ask yourself questions. The author might say "for an SN2, tertiary substrates are not preferable due to steric hindrance" and you need to internalize that by MAKING AN EXAMPLE in your head "ok, so I can't use, for example, isopentane like compounds for an SN2 because it's tertiary". Then you need to ask WHY is this not favorable "Ok, so the methyl groups are gonna be spinning around and that bulk will make it hard for the nucleophile to find an entrance to kick the leaving group out" The key is to study efficiently by taking your time in reading the material and "getting it right" the first time around by really internalizing everything. Do not kid yourself by saying "this is trivial" NOTHING is trivial.
2) How many days or weeks did you study before your ochem midterm or final?
One week, design a plan for what material you'll study over the week (encompass all the lectures, start from the beginning to the end). Practice problems are key. For every missed practice problem, internalize the chapter/section that you missed. Ask what the UNDERLYING concept you missed was, don't go "oh yeah I forgot you can't do sn2 on tertiary substrates, duh i'll remember that on the exam" NO, you need to say "that's right tertiary substrates are too sterically hindered for SN2, let me create some examples where it wouldn't work" For organic synthesis questions, get a friend. Have the friend create a synthesis in the forward direction (aka start with a random reagent, do 2-3 reactions). Then have him present the reagent and the product, and the number of steps, and work the reaction backwards. Make sure you do the same for him. This is a very easy way to generate reaction questions as you can't possibly mess it up (you're generating reactions in the forward direction so your friend will know the answer by making the question, if this makes sense)
3) How did you study the concepts/reactions/mechanisms?
DO. NOT. MEMORIZE. BLINDLY. PERIOD. END OF STORY. STOP DOING IT. The key to science is understanding CONCEPTS, not blindly memorizing reactions. You see, organic chemistry is nothing more than understanding two concepts: thermodynamics, and kinetics. There is some molecular orbital/QM flavor in there, but it's all covered quickly. If you truly understand WHY the reaction works, you will always be able solve "box" (reaction prediction") question with ease. There are fundamental "prototypical" reactions, like the aldol, the robinson annulation, the SN2, the E1 etc etc. that you'll have to obviously have to know, but I honestly think that you'll memorize those just by writing them out over and over (write out reaction mechanisms every single day, do not skimp on this, this is how you memorize. YOu do NOT learn Ochem without writing mechanism)--you cannot STOP here through. You have to ask yourself WHY is the SN2 preferred over the E2 in one reaction, and why the E2 is preferred over the SN2 in another. You can write mechanism for both, you see, but you need to understand the thermodynamically underpinning FIRST. You will ALWAYS be able to predict a reaction this way. So then you'll start getting 'rules' in your head. You'll know that acid base reactions always happen first, and THEN your other organic reactions, etc. But this will only happen if you rigorously understand the relationship between thermodynamics and kinetics for each reaction--the rest will simply follow. Memorizing reactions is a product of understanding why they happen , not the other way around!
Side note: I saw a girl have a notebook of like.. 150 reactions for our OChem 2 final. She said she'd just memorize it a week ahead and she'd be fine. She got a 60. Don't freakin' do this!! Machines can't solve O chem synthesis problems, and if you design one that can (Look up "CAOS" or computer assisted organic synthesis) you'd win a nobel prize. Understand WHY; DON'T memorize.
4) Solo study? Group study? Or a little bit of both?
Both, but if the group is slacking, be vocal about it. YOUR TIME IS VALUBLE, so, without coming off as being pretentious and entitled, you need to assert that you want to stay on topic because you'd like to understand the material. But don't turn into a robot, y'know. Take a break and chill sometimes, it's good for you.
5) How do you reduce stress when ochem midterms are coming?
Stress is inevitable, but if you have good meta-cognition (how well do you know that you know the material?) then that should quell your nerves a bit. Remember, OChem IS tough, but you're putting in work. There is NOTHING in this world that cannot be solved without adequate hard work, and if you don't kid yourself about that, then you and I BOTH know you'll be fine 🙂