As per my knowledge, you can join the following classes:
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Parmagam Honours (5 year online course for shastri on Jainism, https://practicaljainism.com) (Certificate of Completion Available)
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Arham Pathshala (Online interactive class for everyone, http://ptst.in/ptst-admin/registration_arham.php)
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Jainism classes by Pt. Vikas Ji Chhabra & Pt.Prakash Ji Chhabra (channel, http://jainkosh.org)
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JinSwara daily online class (https://jinswara.com/)
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Gunasthan Classes by Pt. Praveen Ji Shastri (Channel Link)
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Classes on different topics by Pt.Sanjeev Ji Godha (Channel Link)
Other Channels to view classes: