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CRA new rules state: 

• for 2017 and later years, to claim a scholarship exemption, you must be enrolled in an educational program in respect of which you are a qualifying student in 2017 or in 2018, or were eligible for the education amount in 2016". Also;
• Consideration must be given to the duration of the program; any terms and conditions that apply to the award; and the period for which support is intended to be provided by the award.

You should still qualify for the full-time exemption if you were enrolled and qualified as a full-time student, and the grant applied to the program which you withdrew from. 

Here's the CRA link, and it is suggested you contact them for further clarification on this. 

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...