Mark a height on your reference line(which is perpendicular to your horizon line), eg: 1/3rd the height of the line, and draw a line from that point to the vanishing point. that way all heights will remain fixed along that line.

Try blue

Yes

If you are a student of DQ labs. You will receive the online class links to your email id registered with edge.dqlabs.in

Class 12 physics and 11 chemistry

Nope

no...u can attend only one because both exams are conducted at the same time

No it does not matter