PLEASEEE HELP L

hy. i've recently passed step 1 and have now moved to step 2. one thing that really hunted me was ecg especially 12 lead.
can you please guide me how to learn it for good. so i can use it to both pass me exam and develop this skill for clinical use.
any video? book ? anything
i've good grasp on cardiology concepts and no problem interpreting single strip ecg

Hey i need advice, can anyone of you guys please help genuinely
I want to take step 1 at end of nov
I have attemped 2 nbme
29 - 78%
28 - 79%
Have not done biostatistics yet, have to complete first aid read
Should i lock in and just go for end of nov or delay it

So I am just beginning my step 1 journey, I wanted to give a baseline nbme before starting not really sure from where to do it? People mentioned it can be done offline, how do we access it? Any help would be appreciated.