its great to hear that you are computer scietist, as i had also a same background, i have sound knowledge in technical aspects, but when i go through the syllabus then i found that theory is more important then technical knowledge so concetrate more on theory,
such as
basic developement of computer
basic developement of languages
periods of computer age
concepts of basic languages and their basic funtions
database, such as oracle
files concepts such as kernal and others are important programmes, concept such as malware, firewall and many more
and also read some good book of MCQs it will gives you a tharough concepts

keep it up, you have another advantage that you have already covered these topics, so it will also save your time. but dont take subject so easy beacuse its sounds too much technical. but mark scoring will be easy for you inshallah

best of luck
hope for the best

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