--- Pearson Edexcel International A Level Chemistry Student -

If you meant something else by "solid content" (e.g., states of matter / solids in chemistry), or you need a specific past paper question explained, please clarify and I’ll give a targeted answer.

Here, the focus shifts to thermodynamics and more complex organic reactions. --- Pearson Edexcel International A Level Chemistry Student

The must be a strategic test-taker. The mark schemes are notoriously specific. If you meant something else by "solid content" (e