Is it too late to start?

I just got my Prelim results back and sit at a 35 L1R4. Honestly, it was a wake-up call, but I’m ready to lock in. My target for the actual O-Levels is an 20 and if possible an 18.
I’ve talked to seniors who said they went from 40s in Prelims down to a 15 (or even lower) in O's by completely changing their approach in the final stretch, so I know a big jump is possible if I execute this right.
My subject combination is English, E-Math, Pure Geography, Chem/Bio, and POA.
For anyone who made a similar comeback, is an 18 or even lower, realistically reachable from a 35 at this stage? How should I structure my revision right now, stay focused, and actually start?

Subject Specific Tips I'm Looking For:
English: How do I efficiently improve my Paper 2 (comprehension) and structural flow for Paper 1 (writing) in a short time frame?

E-Math: Best ways to grind topical vs. yearly TYS without burning out on basic careless mistakes.

Pure Geo: How to balance memorizing core concepts/case studies with writing structured essay responses quickly.

Combined Science (Chem/Bio): Specific strategies for tackling practicals, key keywords for Bio, and standard reaction/calculation templates for Chem.

Principles of Accounts (POA): How to be good at double entries formatting and financial statement adjustments under time pressure.

Other advice I would appreciate:)

1. Where to Start: How do I prioritize my time between subjects I'm failing versus subjects I'm close to passing?
2. Staying Focused: How do you cut out social media distractions and handle exam stress when you feel behind?
3. Revision Schedule: What does a realistic daily study routine look like between now and O's?