does anyone have an easy to not mix up sufficient and necessary conditions. i keep mistaking them not matter what i do

i got confused on #3 and #4 and did them in opposite order. whats the easiest way to spot this

i had the right answer and second guessed myself and changed it..... i hate myself

i knew D was the conclusion but i always forget about sub conclusions. hope we go oveer them more cause i am def understanding the stuff better with 7 sage so far.

i think with the sub conclusions there should be another color to clearly see all 3. after some initial struggle i got all the conclusions and premises correct based off red and blue but when you watch the video and he explains he breaks down further and thats were i need the most help with

this is my 3rd prep course in a month and a half and im already more excited than i was with the other 2. cant wait to ace the lsat