Sign up to daily emails from political newspapers - Huff Post and The Spectator do great versions of these.
2. Watch the news and keep up with current affairs - current affairs act as the evidence section of politics essays so it's critical to keep a note of these.
3. Make essay plans and source essay plans - these help to focus your revision to ensure you will be able to tackle the exam question effectively, as opposed to just learning lots of facts.
The Spectator - https://www.spectator.co.uk/
The Huffington Post - https://www.huffingtonpost.co.uk/
The Telegraph 'Front Bench' - https://www.telegraph.co.uk/newsletters/front-bench/