Hi there,

As we know that in this pandemic situation all the offline classes are shut and scope of online classes has increased. So, number of youtube channels has also increased. You can find different channels for mechanical engineering 1st year maths students

Some of those are following:

Mechanical Mania

Mech-o-tech

4Mech Engineering

Mechanical Engineering

Mechanical wing

NPTEL video lectures

Mechanical Engineering Explained offical

Mech zone

Hope it helps you

Good luck!