I wouldn't bother with DuoLingo, Roseta Stone, BBC Bitesize, or any course which encourages you to learn Spanish by means of learning phrases.
I learnt Spanish using Michelle Thomas method and can't recommend it enough
2003. For listening, we had a small number of pre-scripted conversations to learn. People memorised the responses needed for the scripts rather than understanding anything. Had the examiner gone even a tiny bit off script, we would have all been completely lost. I can't remember the writing assessment.
There are two ways of learning languages (as I understand) and different people learn in different ways. I have friends who speak many languages - who start by understanding the mechanics and structure of the language - and those who learn mostly by imitation and repetition. Similar to learning a musical instrument in a logical - follow the instructions way, or just copying tunes. I’m shit at both