Alba Mathematics encourages the nurturing of deep thought and self discipline. Due to this, we have taken the decision not to publish answers or worked solutions at Higher level. We believe the hint sheets offer the appropriate level of support to help you reach the correct answer. If however you wish to have any answer checked, you may email your own attempt and we will confirm its validity and offer further advice. 
We hope you agree this is the best way forward and designed to help your preparations for the final exam.