I wouldn't bother with a pre workout. Its just more expense and I'm sure we can all agree that between gym memberships, proper nutrition its expensive.
The side effects are not worth it - Crashes, sweats, bad skin, jitters, insomnia are very common & that is too name a few. Your body also builds up a tolerance meaning you tend to up the dose/scoops.
Now you might say ''Oh big deal that only costs £1 a week'' fair enough but I am on about the stress on your body. Is 600-1000mg + of caffeine a day good for you? Not too mention all the other sh1t in these pre workouts.
Most of the ingredients have zero scientific backing and you have no idea what is in them. You will not believe the amount of counterfeit pre workouts going around atm!
Get a light meal down you. Some chicken and brown rice, Whey and oats or something.
You'll have a lot more energy and won't feel like you're on smack.