Private Transfer from/to Singapore & Legoland (or anywhere in Johor Bahru Malaysia)

Entering Malaysia
1. Passport
2. Malaysia Digital Arrival Card- Must be fill-out within 72hours prior entering Malaysia. It's Free. Here's the link Malaysia Digital Arrival Card - MDAC

Re-entry to Singapore from Malaysia
1. Passport
2. Singapore Arrival Card- Must be fill-out within 72hours prior entering Malaysia. It's Free. Here's the link ICA | SG Arrival Card

No. That is the advantage of using private vehicle not bigger than Starex or 10 seater vehicle. No need to go down at checkpoint and queue at the immigration. You just need to show your passport through car window (Driver will assist) and you are good to go.