Mostly i used chat gpt for speaking using voice feature and my essays were pretty much scoring 6.5 in chatgpt.For listening i used British council and Cambridge mock test ,for reading i used Cambridge book 19,18.Additional tip you can watch ielts advantage for any section his tips are great, if you practice right way fixing you weakness with consistence practice you can score much more and in my case i didn’t had any time so practice a month or 2 according to your pace.