is science an easy subject to take at level 3 compared to others?

HI, I am currently 17 and in college. I messed up years 9,10,11 in high school and ended in a pru which only let us sit English and maths GCSE. long story short I failed both and realised that I wanted to study and prove myself to everyone so I enrolled at a local college on a BTEC First level 2 in business.
It was a totally new subject for me and I only managed to get a Level 1 Pass. thing is I got all my passes but for some reason only level 1 and it really upset me. But it is a big achievement for me coming from a small referall unit to mainstream college and because I had missed so much education I am really far behind so maybe that's why I didn't pass this course?

SO I can do a level 2 at a different college then progress onto level 3 then get goo grades and apply for uni. Now I have applied for Applied Science Level 2 but im worried its going to be too difficult for me. I want a subject which is relatively easy. I know its hard to establish what easy is especially when all courses will be at same level but some subjects are naturally much less stressful. if I do this level 2 BTEC in science and progress onto Level 3 will it be too difficult?