Before you touch a pencil, read the "Theory" section for a specific chapter. Dubey writes in bullet points under headings like "Important Points" and "Common Mistakes." Spend 15 minutes internalizing these.
We must address the elephant in the room. The high volume of searches for indicates a genuine need for accessible study materials.
At the end of each major section, Dubey flags questions from past exams. These are your gold mine. Set a timer (20 minutes per problem) and attempt them without looking at the solution.
You can download the PDF of "Engineering Drawing" by N.H. Dubey from the following link: [insert link]