Roll back more than an inch and look out for the fail !!
To the OP -
Your first problem is in your thinking that you MUST get away quickly at lights with others behind you
If you start thinking - I will go when I am good any ready - then it will all fall into place
Your own thinking process in this situation is making you nervous
No other road user EXPECTS a learner to get away quickly - they might LIKE them to but they KNOW it is not likely to happen - why do you think most like to use the other lane if there is one ......
id change instructors.
We all have times when we stall even us more experienced drivers.
Practice makes perfect. don't panic yourself.
That driving instructor sounds awful, not what you need if you are a nervous driver.Bin him off and find another, more empathetic instructor.
To those who feel rushed in traffic: I assure you it feels much longer to you when you feel under pressure than to those sitting behind. Most drivers really won't be paying that much attention as they stumble through traffic and probably won't even notice if you take a second or two longer than a more experienced driver. And even if they do notice, for the sake of a second or two it doesn't make any difference at all. Anyway they were learners once, and it's unreasonable to expect you to be lightning fast.
So basically, TAKE YOUR TIME. Don't worry about what other people think and just keep calm and concentrate on getting it right, in just the same way as when you're moving off alone on a quiet residential street. Once you're happy doing that, in no time at all your skills will improve and you'll be able to start doing it a little bit faster until you're just like everyone else.
my instructor always used to tell me to come off the clutch slowly, by degrees, the width of a pound coin each time (does that make sense?) either way, you NEED to come off your clutch nice and gently because as you know lifting up too quick causes a stall. You can apply more gas, sure, but you shouldnt lift the clutch quicker if you dont know the bite and the car well enough yet, because you could still stall and miss it anyway. Its just going to take practice. The car I learnt to drive in had a large engine, so I had to make sure the amount of clutch lifting and accelerator (sp?) pressing was balanced, yet my own car has a tiny engine, so only wants me to come off the clutch and apply a tiny amount of gas, so you just need to learn the car and work out what is most effective. The point is, make sure you have enough gas for the engine to be purring, but still come off your clutch gently.
Why doesnt your instructor let you hold it below the bite ? and do you get on well with your instructor ? Obviously I dont know and dont want to judge, but from what you've said, he/she seems a bit harsh? they should be constructive in their guidance towards you.
I would always suggest using the handbrake, as in the test it is expected of you, and the examiner wont think you've stopped properly unless its on. If you roll back in your test, you will get some minors for that, if not a fail.