what's better getting admi. in B or C grade colleges for first year engineering or taking second year diploma from A grade college then s.e?

i'm from mumbai my cet score is low but i think i can get admission in B or C grade engineering college for first year engineering but instead of taking admission in this grade college is it better to do second year diploma from A grade college like vidyalankar & then doing s.e. engi. from same col.