What is the first test to be conducted on materials like fine aggregates, coarse aggregates and soil in a laboratory?

For fine aggregates conduct tests on organic impurities,silt content, particle size and bulking

For coarse aggregates conduct sieve analysis, organic impurities & shape(flakiness elongation)

For soil- Soil investigation,Plate load test,Sampling, Proctor test, CBR test.

Tests to be conducted based on the nature of work. 

Wet sieve analysis, wash the sample through 75 micron sieve.