Dipxel

So i am at Tier 3 in Sci and i wanne get more Sci but it is hard when you don't get alot/Anything of just Orbiting Kerban. So i see alot of guides but there are for the Demo or for people who have somehow completed the game but still needs to see a guide. So any help? If you help me i would bee happy:) [Yes English is not my first Langue]