Track Type: Shroomer / Frontrunning 
Best Shock Spot: Target shock beginning shortcut If you are starting in a middle or rear spot, miss the start boost so you can take the first shortcut without being bumped off, meanwhile you’ll get a good item and pass everyone in the pack who bumped each other off. Knowing how to do both shroomless shortcuts is crucial to doing well here. After them there’s also a couple optional of mushroom shortcuts. Absolutely practice this one in offline VS mode.
Video Guides
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Mario Kart World Guide | EVERY Shortcut & Strategy you NEED to Know! by L1am (for Bowser’s Castle skip to 1:29:31)
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How to do the BOWSER’S CASTLE Turn Skip Shortcut (with Controller Display) by Shortcat