9. Can. Because the receipt does not indicate who's using the book. And its impossible for them to check on the BOOK itself other than the receipt. You can collect all other receipts for book purchases from other people.

4. Yes. Receipts do not bear the payer's name and no one knows who paid for it unless its through credit card/cheque. Otherwise, just claim as your expenses for your parents' medical bill.

I think it depends on your policy. Your insurance company can restructure your insurance statement to show which amount goes to which plan (medical or life)... this way a total break down of your annual premiums can be used for tax relief. It all depends on your insurance company. Talk to your agent/rep.

Keep your receipts for 5 years (i think around there). Keep in a folder, and (if possible) scan all your docs for safekeeping.
But chances are, LHDN won't look for you unless you earn A LOT of money.

Once you have submitted, note down your account number/amount to pay and don't delay in payment.
A few selected banks accept payments for LHDN.

I fill in BE form only la.

Purchase of books and mags do not cover newspapers.
And certainly, electronic publications don't count.