My professional goal is tobecome a foremost lecturer and researcher in the field of Electrical Engineering.
However, I always can manage my time to execute different tasks in parallel without getting distracted, as in the last year I was involved with membership in three student organisations, nevertheless I achieved distinction grade (89%) and I was ranked 12th out of 307 students last year.
This sentence is too long and you better break it up. When your sentences are too long, the reader finds it difficult to memorize details you keep on telling. So your flow would be disturbed by lengthy sentences;
However I am capable of managing time to handle several different tasks parall without getting distracted. For example, I was involved with membership in three student organizations last year. However, at the same time I was able to secure a distinction grade (89%) and the rank of 12th out of 307 students.You can support your arguments, claims and reasons with examples. That would have more effect in convincing the reader. :)