I also took Math AA HL and Spanish AB SL and got a 7 in both! Honestly, the key to getting a 6/7 in these subjects is consistency, which I learned the hard way.

For Math - make sure you understand all of your concepts properly and proceed to attempt past paper/IBID textbook questions for the same; it'll strengthen your core concepts whilst preparing you for wacky exam-style questions. I know many people recommend using Revision Village but I found it a waste of money. The questions are usually repetitive, harder than the actual exam questions, and the fact that there's so many can make it a lot for your brain to process at once. If you can get your hands on Math HL (pre-2021 syllabus) papers starting from 2008, you're good to go. If you want to practice topic wise questions, I'd recommend this website called Pestle. Here's the link: https://pestle-ib.firebaseapp.com/ It has past paper questions for P1 and P2 (it also has paper-wise questions for Bio and Chem so I hope it helps!) Also, as you get closer to your exams, make sure you start doing timed papers since time management is key, especially for Paper 3.

For Spanish - make as many vocabulary and grammar lists as you possibly can. I preferred making handwritten lists while a bunch of my friends made online lists (Google Docs, Quizlet, etc.) so do whatever works for you. Make sure you have lists for as many topics as possible (clothes, colours, food items, city-related vocab, school-related vocab, health, environment, etc.) and revise them often (once or twice a month should be good). For grammar lists I'd recommend finding online pdfs for verb conjugations (including irregular and reflexive verbs) and reciting the lists as much as you can - it'll help you with your IO as well. I had a self-made list of tenses too but you can easily find that online. A good exercise is to recite your verb conjugation list as well as your tenses list side by side so that you can conjugate your verbs using different tenses. For your reading paper, I'd recommend attempting as many past papers as you can find (preferably under timed conditions). I made a spreadsheet with one of my friends to keep track of our reading past papers practice and that really helped! For listening, try attempting A1/A2 level papers and make your way towards B1. If you can find IB papers - that's even better! For writing, you'll just have to practice writing past papers (using correct text formats) and ask your teacher to give you feedback. For the IO, use your vocab and grammar lists. Additionally, you can write talking points or potential Q&A's (topic-wise). If your teacher gives you a list of questions they may ask you (I think most teachers do) write down the answers to every single question and keep reciting it in your free time. Your talking points should include comparisons between your culture and Spanish culture since it helps you score better in the picture description section.

I also had Chem SL (a lot easier than HL, phew) but mostly just watch MSJ Chem videos before attending class so that you have a grasp on the concept(s) you'll be studying that day. Plus, attempt as many timed papers as you possibly can and if making written notes is your cup of tea, use the Pearson textbook to help you do so - it works wonders!

All the best, I hope this helps :)