I was at 375 then at 390 and now at 422(after i get sibling points today) I wrote IELTS thrice over 9 months.
Test 1 - L-8, R-8.5, S-6.5, W-6.5
Test 2 - L -8, R-8, S-7, W-6.5
Test 3 - L-8, R-8.5, S-7, W-7
Trust me IELTS is not that hard. I had never really practiced writing and was not getting 7. And then I did practice a few essays for 2 weeks and got the desired score. If you need help regarding writing in IELTS i can give some useful tips that I followed. Just give me a message. All the best.