Never trust a third-party site before checking the source. Most exam boards offer the last 3-4 years of papers for free.
Using an outdated paper can give you a false sense of security. You might ace a paper from 2018, only to discover on exam day that your syllabus has changed, the format has shifted, or the required depth of explanation has intensified. chem past papers updated
Many updated chem past papers have seen the MCQ section increase in difficulty. Students often skip it, thinking, "It's only one mark each." However, the MCQ now often includes data-based questions and "multiple multiple-choice" (e.g., "Which of the following three statements is correct?"). Practice these relentlessly. Never trust a third-party site before checking the source