HL:
TZ1: https://www.reddit.com/r/IBO/comments/8ipw83/exam_discussion_physics_hl_paper_1_tz1/
TZ2: https://www.reddit.com/r/IBO/comments/8ipw8v/exam_discussion_physics_hl_paper_1_tz2/
SL:
TZ1: https://www.reddit.com/r/IBO/comments/8ipwc1/exam_discussion_physics_sl_paper_1_tz1/
TZ2: https://www.reddit.com/r/IBO/comments/8ipwco/exam_discussion_physics_sl_paper_1_tz2/