

Conclusion
I see some good lines and good ideas, combining to make a lap with a lot of potential. However I also see that your braking application is a little slower than it needs to be, and it's forcing you to brake earlier than you would otherwise need to. Also, you seem to take a few corners in a higher gear than ideal, and this could cause understeer, causing you to brake even earlier. Make sure to establish the right gear for a corner and ensure you can change down to it in time.
Set Up Advice
This is a track that relies heavily on having a soft suspension setup, to help use the kerbs and bumps to turn at slow speeds. High downforce can also help with this, as well as low differential settings.

Segment 1
☐ Initially I notice that your entry to the corner is much shallower than the reference lap. Your braking comes slightly earlier but you take longer to achieve full force. This could be a point of improvement, so make sure you hit the brakes hard initially. This will help you to shorten the braking zone with the same effectiveness. I notice that you also use 5th gear here, whereas the reference lap uses 3rd gear. This might force you to over-slow to compensate for the understeer this will induce. Make sure your car is comfortable in the gear that you're using. A similar thing can be said for the exit of turn 3, where you use 4th gear compared to 2nd for the reference lap. This will help you accelerate and use all of the available track width. Your line through the first corner is good, however due to slowing more than the reference lap, you don't quite make it to the outside kerb. This promotes you to hug the kerb of turn 2 for longer than the reference lap, and means you have to slow more for turn 3. Due to you using gear 4, you don't get the same drive out of the corner, so it's important to ensure that you're maximising speed both into and out of the corner here.
Segment 2
☐ The braking zone here is a difficult one, as it forces you to drive close to the wall while there is a small turn in the road. It's important to make sure you're still close to the outside wall before you start braking, because this will mean you don't have to slow as much or turn as tight. It seems like you take a very central line for the entry to this corner, and it means that you have to brake much earlier. You also accelerate very early, which means that you can't corner as quickly as you should. Accelerating before the apex will most likely create understeer, so make sure you accelerate late enough so that any understeer can be managed without sacrificing speed.
Segment 3
☐ This section is flat and driven very well
Segment 4
☐ Your line on entry is quite shallow as well, but your line matches the reference lap for the most part. However, I again see that you start accelerating before the apex, and it gives you understeer, meaning that you're actually going slower than if you weren't accelerating. This is particularly noticeable on corner exit, where the reference lap is able to get to full throttle much earlier than you.
Segment 5
☐ Your line on entry is again shallower than the reference lap, but for a hairpin it's important to give yourself the most space you can to maximise speed through the corner. There is a small blip of the throttle before the apex, and this would probably lead to more understeer again, so make sure you can fully accelerate before you start. This will help you massively on exits.
Segment 6
☐ Overall, this corner is OK. I see that you drive this corner in 4th rather than 3rd gear, so this might be an adjustment to make, however your line is widely the same as the reference lap. Just focus on trying to brake later and accelerate earlier.
Segment 7
☐ I notice that you are in 5th gear rather than 3rd gear. For a corner like this, it could cause major understeer, so make sure the car is cornering comfortably in the gear you're driving. Additionally, you turn much later than the reference lap, meaning you would have had to slow more to turn tighter. Turning earlier here will help you to carry more speed through the apex and will also help set you up better for the next chicane.
Segment 8
☐ Your line into the corner is compromised somewhat by your tight exit from the previous corner. This sends you into the corner at a much shallower angle, forcing you to slow down more the reference lap. As a result, your acceleration is also compromised, as you're still finishing your turn while the reference lap is accelerating away straight.
Segment 9
☐ Your line is very good, however you don't brake as late as you can. A good point of reference is looking at where the bridge ends. Once you straightened out, you can brake hard to still make the corner. This will extend the time you spend at full throttle before the corner. Also, I see a small blip of the throttle in the middle of the corner again, meaning you have to wait even longer to accelerate fully. Make sure you can smoothly reach 100% throttle before you start accelerating.
Segment 10
☐ I see that you brake before the reference lap, but you reach 100% force at the same time. For a car like this and a corner like this, you can afford to brake hard initially, meaning there is the option to brake even later than you did. Your line throughout is good and you acceleration almost matches the reference lap, aside from a small delay towards the end of the acceleration zone.
Segment 11
☐ Similarly to the previous corner, you brake earlier but you reach 100% at the same, meaning there's room to brake later. Your line and throttle is similar to the reference lap, so try your best to focus on preserving speed for corner exit
Segment 12
☐ It's a similar story with the braking again here, so focus on hitting the brakes hard initially. Your line and throttle is good, however I notice that for the second apex, you drive into the corner from a much wider line, meaning you have to turn tighter. This actually scrubs off more speed than needed, so make sure your turning for both corners is fluid from one to the next.
Segment 13
☐ A similar story again with the braking here, however this time you don't reach 100% at all. It's important to slow for these 2 corners as they're tighter than they initially seem. Make sure that you're maximising exit speed again, and this usually involves slowing heavily for the first apex before accelerating through the second apex.
Segment 14
☐ Your line and braking on entry is good, however I see that you're more tentative at getting on the throttle again, despite the fact you have the road on exit to accelerate earlier. Try to make a smooth but early throttle application here to help slingshot you onto the home straight again and set yourself up for another lap of the Marina Bay Circuit.