I am starting to write my Statement of purpose and I am currently doing Btech in ECE but want to pursue CS/Informatics in TUM,Germany.How should i justify my change of major(I am genuinely not interest in ECE), also I had 2 backlogs in 2nd year which I have cleared now but my percentage dropped ,should I mention this?My current GPA is 7 acc to Indian scale and 2.5 according to German scale.Please advise.