1:First of all you have to get car in momentum and keep the momentum even if its a mehran or big engine car.
2:If you are on a manual car the car has be in rev range during which torque is available.Like Reborn manual has high rev torque while corolla and mehran has torque available at low revs.So downshift quickly if rpm is low.And keep the car in its power band so you dont get stuck and damage your clutch plates.
3:Floor the accelerator full even if its approaching high rpms dont worry maintained cars will not have any issue.
Inexperienced drivers make the mistake of driving in higher gears and losing the momentum which gets the car stuck and you have then difficulty climbing
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