Will I lose my top secret clearance if i become an officer?

No. Many Officer slots require a TS or higher. You might be downgraded to a Secret while you’re in college, but the upgrade process is simple and doesn’t take long.

Your clearance will terminate when you leave the military or retire. Any employer who has positions that require government clearances is only interested in whether you have gone through the background checks that enable a clearance. The employer must request granting of a clearance and can judge how long the checks will take based upon what level you once held and the period of time that must be covered to reissue at the level required by the position he is offering.

You would never lose your clearance, the level may be suspended, otherwise a wast of money. If you do not have an active TS when you are commissioned or separate from service, it is all about the timing of your last BI, generally only good for 5 years with a TS.

If you don't fall into a TS officer slot you will be down graded, but probably keep TS until that slot is determined. I was 35F then went QM (only secret), but kept TS until it expired, and was downgraded Secret at the renewal (basically, the system was lazy, a TS would need a renewal at 5, but could magically just downgrade me to S and get me another 5 without any work).

In the grand scheme of things, losing TS doesn't mean anything. If you don't have a position that requires it you are not missing anything. The fact you had one BEFORE matters just as much as anything if you find yourself in a new position that requires it.

Not at all

No, I have literally never had the need to know TS/SCI information. They renew my clearance every time though.

No, but if your billet doesn't require a TS access you will lose your access.

Simple answer is MAYBE. TS is given when you have a need to know!! If you become a "Zero" and do not have a "need to know" you'll LOSE it.

You wouldn't retain a clearance unless your MOS/Career field required it. Also it's the background investigation that's important.

I seriously doubt it. If you are aware that you are due for reinvestigation, I would advise the office of the school's commandant in writing.