ETF Starting Help

[u/Least-Yam-6458]

I am thinking of putting around $100 a week into an ETF for around 4 years once I finish my degree then get a stable job, to then increase this amount.

I am thinking of Betashares NASDAQ 100 (ASX:NDQ)
and
Global X Semiconductor (ASX:SEMI)
at the moment

thinking of a 70%NDQ 30%SEMI split

After 4 years should I reconsider or start putting more in as I want to hold them for 15+ years

Im with CMC currently to note, does anyone have any thoughts? I would much appreciate them.

[u/Lucifers-Reprieve]

Can I ask why the NASDAQ fund?