those who qualifiy this test will be given scholarships to the mentioned countries right away or will there be anyother exam or anyother thing such student should be already enrolled in uni. etc.?

Once shortlisted on the basis of this test candidates will apply online to the commonwealth commission and provide language test results. They will also mention the unis they want to apply to. Scholarships are mostly offered by uk only. Commonwealth commission also conducts interviews I think. Once candidates apply to the commission they are evaluated along with candidates from other countries so the competition is tough.
For now we should all focus on the test as it is the first and most important step for selection as initial short listing is on the basis of this test solely.

can an engineer apply for MS in management?

can someone senior shed light on the syllabus for engineering and management?

yes but I am not sure which subject you have to select in the test then

The overall test remains the same only percentage of different sections changes for different subjects. for engineering there are 40 questions from analytical reasoning. Get Smart Brain by Muhammad Idrees and start preparing for the test from it.

there exists an option of commerce/management in the subject list

will there be analytical reasoning portion for commerce/management subject in the test ?

Some help would be appreciated as it would help us in preparing for the releant questions

Yes, Analytical Reasoning will be for all graduates including Commerce and Management graduates.

Analytical Reasoning can be prepared from GAT or LSAT Book.

analytical portion is 35% for business and engineering fields while for the rest it is 20%.

Test is same for all subjects. It is on the same pattern as GAT general but difficulty level is a little higher. It is a highly competitive scholarship. NTS will shortlist 30 candidates on the basis of test score and keeping in considerstion the provincial quotas. If you are from Punjab, you should aim for 85. From other provinces, aim for 80. But some might have cutoff at around 75 too (GB or Balochistan). After shortlisting, your names will be forwarded to Commonwealth Commission. There you will have to submit online form alongwith personal statement, reference letters etc. and will have to take IELTS. You will give university preferences and will also have to apply to universities separately. 900 names are sent to Commonwealth commission from around the world including 30 from Pakistan and the commission awards scholarships to 300 students. So even after being shortlisted, there is only one third chance of being selected. The process is long and final selection takes place in next April and classes commence next September. Me and one other person on this forum were shortlisted last time but didn't make the final cut. They do not give you any reason for not selecting.

what about the IELTS test.
will it be managed by myself or commonwealth commission will bear its expenses?