Generally, CES does not require the submission of documentation for all secondary and/or prior post-secondary education in order to have the highest credential(s) assessed. An applicant may choose which credential(s) he/she would like to have assessed.
However, CES reserves the right to ask for additional documents and/or information when necessary.
For Immigration purposes, CES cannot answer questions on behalf of Immigration, Refugees and Citizenship Canada (IRCC) to determine if you need to have all your qualifications assessed or just the most recent qualification. We would suggest that you contact IRCC directly or visit their website for the required information.