Do you know how to zero a scope to the rifle? Have you tried it and it's still too high? Might be your scope mounts are too high, or the rifle just needs a lot spent on it to bring it up to scratch.
First thing is to try and zero the scope. If you can find somewhere safe to do so, set up a cardboard target about 2 foot square about 15 yards from your shooting point with a large cross drawn on it through the centre and to top & bottom edges and side edges. Aim at the middle of the target and fire 5 shots. Where do your shots land? If left or right then turn the windage adjuster turret (the side one) of the scope in the direction you need the shots to move (i.e. if the shots are to the left of the centre line, move the vertical crosshair towards RIGHT or R about 10 clicks). Repeat the 5 shots aiming at the centre. Have the second five shots moved closer to the vertical line, or on it, or now to the right? If still left but closer, move the vertical crosshair a further 10 clicks. If the shots are on the centre line, leave the windage adjuster alone. If right of the line, move the windage adjuster back 5 clicks and repeat the 5 shots.
Once you are happy that you can put repeated shots close to the centre line of the target look at where the shots are falling vertically. If above the centre horizontal line leave alone for now. If just below, again leave for now. If well below, using the top adjuster move the horizontal crosshair in the UP direction, to move the point of impact upwards. Once you are happy that you can put repeated shots around the centre of the target move it out to 30 yards. The windage adjustment should stay correct, unless you have a poorly set hopup. Now repeat the five shot test. You should find all the shots are falling low. Move the top adjuster UP another 5 clicks and repeat until you can hit the centre regularly. Now move the target out to 50 yards. Again you should find the shots falling low. Repeat the adjuster changes until you can hit the centre regularly.
If you find that even at shorter ranges the scope crosshairs will not come down enough so that all shots are hitting below the point of aim then an old trick is to put a bit of packing under the bottom of the rear scope tube between the tube and the mount. Old film negative used to be the way to go, but it's far less common in these days of digital cameras, but something like that (only one or two pieces) should be enough to lift the back end and get you on target.
