Exams due to take place at schools across Scotland
The first exams of the 2016 timetable are due to begin on Wednesday morning.
Exams are due to begin at schools across Scotland, with the first tests taking place on Wednesday.
Higher and Advanced Higher Classical Studies as well National 5 Lifeskills Maths exams will start in the morning, and National 5 Classical Studies will begin in the afternoon.
On Thursday, exams for English at the Higher, Advanced Higher and National 5 levels will take place.
The 2016 exam timetable will continue to Friday, June 3.
Earlier, it emerged that changes have been made to this year's Higher English exam paper over concerns some questions were leaked.
Candidates have been told not to be anxious about the changes.
An SQA spokesman said: "A potential issue with one of the Higher English question papers was identified.
"We made the appropriate adjustments and a new paper was distributed to centres. Our chief invigilators have been informed.
"We have robust procedures in place to ensure the integrity of our qualifications. We took swift and appropriate action, meaning candidates will sit the examination as intended."