Hi, I study French and Spanish at university.
For English to French translations, you really just need to treat it like a grammar test. Solidify any grammatical concepts that tripped you up. Pay attention to any conjugations, subject/noun agreements, as well as the order in which you formulate each sentence. Vocabulary will obviously be important here too, so obviously, it sounds like you need to do some memorisation. Use Quizlet. Go through all mock papers and ensure you know the translation of any words that tripped you up. If you encounter a word/set phrase in any reading you're doing, and it keeps cropping up, make a note of it. Do as much translation practice as you can. Wider reading should also help you to get a feel for how more complex French sentences are structured.
For AO2 (assuming you're on the AQA exam board), you need to understand the card material well. All card material will be related to or regarding a topic you have looked at in class and hopefully done independent research around. You need to make sure you fully understand all the information given on the card, which basically comes down to reading skills. You need to be clear when asked what the information is telling you, what your reaction to this is, and why. Make sure you don't go off track.
For AO4, you need a "very good knowledge and understanding of those aspects of the sub-theme covered in the discussion." You must consistently select relevant information to support any arguments, backed up by appropriate evidence to justify your conclusions. You must evaluate the sub-theme to a high level. Similarly to AO2, you need to do your own research here. You need to have statistics at the ready to back up your statements. Being aware of current affairs surrounding all themes and sub-themes is needed to score high marks. You need to decide where you stand personally when an obvious debate arises regarding such themes and you must have a pretty convincing argument.
In terms of vocabulary, I'm hoping your teacher would have provided you with several lists regarding each theme? If not, you can find many available on Quizlet or Memrise which other students have compiled together. I personally used the AQA book 'Mot à mot' for vocabulary as well as any lists my teacher provided.
For culture, I'd advise you try to take another interest you have and combine it with French. For example, if you like a certain genre of music, or a certain type of literature, try to find an equivalent in French. Are you a political person? You could read about les gilets jaunes or les banlieues et les 'flics'. If you like history, you could always delve into the French Revolution or Marianne and the Republic.
Keep working on the grammatical areas you find tricky. That's the only way you're going to learn. It's about finding what memorisation method works best for you, but obviously, you need to put in consistent bursts of effort.
Bonne chance . (Translation: good luck)