How to decide whether Audit required or not? Combination of presumptive + business

Taxation
1

Submitted ITR 4 previous year (FY 2024-25). Now entered into trading this year (FY 2025-26).
My income

  1. from other sources = around 6.25 lakhs
  2. from professional services = 45 thousands (as 100% profit)
  3. from intraday = loss of Rs. 4520 (turnover is around Rs. 9730)
  4. From short term trade = Rs. 12560 /- (turnover around Rs. 185000/-)

I know that I have to use ITR 3. But my questions are:

  1. Since there is a loss in intraday trade I cannot use presumptive option (due to 6% rule). So I have to show under business income which require books to keep. But do I have to audit the returns by a CA?
  2. Do I have to show short term profit under STCG or normal business income? (I want to show it under normal business income. And would like to continue with this trend)
  3. Can I show the income from professional services using presumptive option now? (trading under business income requiring books whereas professional under no books required in ITR 3)
  4. If I have to show short term trading gains under STCG, then do I require to pay tax amount extra as advance tax or there is no need to pay tax as total income is under tax exemption slab?

Thanks in advance @Quicko
Adi