Hello

If your question is how should transportation engineering is to be studied for gate.In transportation engineering,you need to score 100%.Max questions in transportation comes from based on direct formula.eg.sigh distance,valley and summit curves,super elevations,design method,optimum cycle length and pavement design methods.As far as basics are concerned,these deals with accident studies,traffic engineering, geometric design,highway material and pavement design.you can also follow some you tube videos like nptel to learn more information. Hope this information helps you.

All the best.