Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 778 173
2) Placement test : grammar for beginners (anonyme) 5 991 388
3) A/AN (webmaster) 5 364 919
4) Auxiliary BE (webmaster) 3 224 165
5) Present continuous (webmaster) 2 999 060
6) Present simple (webmaster) 2 914 324
7) Present simple (webmaster) 2 597 427
8) Present continuous (webmaster) 2 434 320
9) Adjectives (webmaster) 2 093 508
10) A/an (anonyme) 2 015 221
11) Present perfect simple (webmaster) 1 643 439
12) Preterite (webmaster) 1 628 126
13) Vocabulary - Placement test (bridg) 1 619 131
14) Preterite (webmaster) 1 447 486
15) Short placement test (webmaster) 1 443 518
16) To be (bridg) 1 406 159
17) What time is it? (webmaster) 1 349 304
18) Present perfect (webmaster) 1 346 038
19) The alphabet in English (webmaster) 1 321 042
20) Adjectives (anonyme) 1 215 825
21) What time is it? (webmaster) 1 208 358
22) Numbers (webmaster) 1 188 543
23) 'A' ou 'An' (anonyme) 1 175 442
24) Two presents: present continuous, present simple (webmaster) 1 149 314
25) To be (bridg) 1 145 504
26) Comparatives / Superlatives (webmaster) 1 104 138
27) Numbers (webmaster) 1 070 760
28) CAN / MUST (webmaster) 1 058 627
29) THE/ A / AN / nothing (webmaster) 1 033 645
30) Comparatives (webmaster) 1 007 161
31) Family life (bridg) 1 000 776
32) Numbers > 100 (webmaster) 986 286
33) Future (going to/will/present continuous) (anonyme) 963 980
34) Plural (webmaster) 955 722
35) Superlatives (webmaster) 875 223
36) Adjectives (anonyme) 874 743
37) Simple present (bridg) 853 934
38) Spelled words N°1 (bridg) 850 131
39) Placement test beginners: Check your spelling (anonyme) 830 072
40) Introducing oneself (webmaster) 827 172
41) Adverbs of frequency (anonyme) 817 335
42) Family (bridg) 784 740
43) General test-End of high school / Beginning of university (webmaster) 782 795
44) Present simple (anonyme) 780 352
45) Frequency adverbs (webmaster) 777 744
46) Present BE + Ving (bridg) 765 081
47) Genitive (webmaster) 723 646
48) Passive form (anonyme) 721 944
49) Family tree (anonyme) 719 365
50) Preterite: simple or continuous? (webmaster) 716 650
51) Placement test (beginners) (lili73) 701 062
52) Past simple or present perfect (anonyme) 694 038
53) Future (webmaster) 675 907
54) 2 Preterites (webmaster) 662 023
55) Present perfect simple (bridg) 661 112
56) Preterite (webmaster) 620 402
57) List of 200 irregular verbs and audio (bridg) 616 028
58) Modals (webmaster) 612 685
59) Spelled words N°2 (bridg) 609 164
60) Height (webmaster) 606 311
61) Modals (webmaster) 605 412
62) Articles a / an / the (anonyme) 596 759
63) Plural forms (bridg) 577 435
64) Nationalities (webmaster) 574 221
65) Past continuous / Past simple (anonyme) 566 292
66) Irregular plurals (bridg) 553 609
67) Two presents: simple and continuous (webmaster) 549 566
68) Preterite (bridg) 549 006
69) Superlatives (frapedur) 538 782
70) Vocabulary: greeting people (here4u) 536 465
71) Give your opinion (bridg) 531 933
72) Adverbs of Frequency (bridg) 516 941
73) Present simple or continuous (anonyme) 510 942
74) Present perfect / preterite ? (anonyme) 509 556
75) Possessive case (anonyme) 480 631
76) Countries & nationalities (bridg) 473 426
77) 'The' or nothing? (webmaster) 471 222
78) Past tenses (bridg) 470 784
79) Introducing oneself (easy) (webmaster) 470 719
80) Passive voice (webmaster) 463 402
81) Present Simple vs. Past Simple (anonyme) 457 098
82) Questions : how to ask them (anonyme) 448 351
83) General Test II / End of high school / Beginning of universi (webmaster) 446 156
84) IN, ON, AT or TO? (webmaster) 445 164
85) Relative pronouns (webmaster) 444 422
86) Comparative of superiority (anonyme) 438 586
87) How to pronounce the final -ED? (past simple) (webmaster) 437 638
88) Relative clauses (webmaster) 423 244
89) Sounds: [h] (webmaster) 419 495
90) Comparative (anonyme) 413 624
91) A/an/Ø (bridg) 398 784
92) Past simple (anonyme) 397 150
93) Future simple (anonyme) 396 356
94) This / That / These / Those (webmaster) 392 523
95) Conditional (webmaster) 391 631
96) Passive voice (anonyme) 390 522
97) Comparing (webmaster) 387 992
98) Can / could/ may/ might (woodyrun) 379 463
99) Present perfect or past tense (anonyme) 377 351
100) Much, many, little and few (felin) 372 750
101) Personal pronouns (anonyme) 371 281
102) Preterite continuous (BE + -ING) (webmaster) 369 201
103) Some, any, no, enough, too/too much/too many (webmaster) 368 087
104) Genitive case (bridg) 368 032
105) Confusing words - Placement test (bridg) 364 524
106) Irregular verbs (webmaster) 363 562
107) Numbers from 1 to 10 (anonyme) 361 515
108) Past perfect simple, past perfect continuous (anonyme) 360 882
109) Present continuous or present simple (webmaster) 359 536
110) Present perfect or preterite? (anonyme) 356 738
111) Simple Past : regular verbs (anonyme) 352 989
112) Comparative Adjectives (bridg) 352 187
113) Who, Whom, Which, or Whose? (anonyme) 348 784
114) Past simple (video) (anonyme) 348 334
115) Past simple or past continuous (anonyme) 342 615
116) While / When (anonyme) 338 715
117) What time is it? (webmaster) 337 827
118) Modals (tinou) 336 524
119) Modal: may/might (anonyme) 334 198
120) Cardinal and ordinal numbers (anonyme) 328 706
121) The superlative (anonyme) 325 416
122) Possessive adjectives and pronouns (woodyrun) 324 187
123) How to talk about the weather (lili73) 320 880
124) Since and for (anonyme) 318 796
125) Flags (webmaster) 317 546
126) Irregular verbs (bridg) 315 976
127) Prepositions - in, on, at (anonyme) 314 111
128) Pronouns (woodyrun) 313 609
129) Tenses (anonyme) 311 894
130) Placement test 3 (webmaster) 310 439
131) Order of adjectives (webmaster) 306 553
132) Could/Couldn't (laure95) 305 827
133) Comparative (anonyme) 304 509
134) Agreement Tags (webmaster) 304 007
135) Adjectives and prepositions (anonyme) 304 005
136) Asking questions (webmaster) 303 072
137) Present perfect OR simple past? (bridg) 298 342
138) Questions in the past tense (anonyme) 297 521
139) Superlative Adjectives (bridg) 295 767
140) Uncountable nouns (webmaster) 295 603
141) Object pronouns (bridg) 294 915
142) Placement test 1 (anonyme) 292 770
143) Present simple (anonyme) 291 204
144) Passive form (anonyme) 291 132
145) Prefer/rather (bridg) 289 351
146) Can/Must/Should (laure95) 289 203
147) Past perfect (lili73) 288 072
148) Must or Have to? (woodyrun) 287 436
149) The/an/nothing (bridg) 285 207
150) To be (anonyme) 283 469
151) Can and can't (laure95) 281 501
152) Vocabulary: asking and answering (here4u) 280 441
153) Modal verbs (bridg) 277 232
154) Some / Any / no... (bridg) 270 443
155) Days of the week (bridg) 269 101
156) So / neither (anonyme) 264 336
157) Past simple (video) (anonyme) 263 685
158) Used to (bridg) 260 361
159) Present continuous (chnawa) 259 992
160) Should / must (anonyme) 259 524
161) Past tense (anonyme) 259 279
162) Vocabulary: on the phone (here4u) 258 725
163) Find out a quantity (webmaster) 258 536
164) Superlative + and adjective (anonyme) 257 152
165) Articles : a / an / the / Ø (anonyme) 256 859
166) Comparative and superlative (anonyme) 255 211
167) Numbers 1/100 (anonyme) 253 620
168) Modal can (video) (anonyme) 252 961
169) Comparatives (anonyme) 248 035
170) Relatives pronouns (who, which, that...) (anonyme) 247 838
171) Vocabulary: at the restaurant (here4u) 245 652
172) A few, a little, few, little (anonyme) 245 246
173) Would rather / would prefer to (anonyme) 244 228
174) Present continuous and the Going to form (anonyme) 242 537
175) Should/ have to/ must (anonyme) 239 915
176) Have something done (anonyme) 239 785
177) The past (webmaster) 237 778
178) Future continuous and future perfect. (felin) 237 600
179) Used to/would (woodyrun) 237 575
180) How to ask a question in English (bridg) 235 388
181) I wish, if only (felin) 234 058
182) Pluperfect (webmaster) 233 892
183) Countable or Uncountable? (webmaster) 233 119
184) Some / any (younes91) 232 730
185) Should / shouldn't (anonyme) 231 470
186) Present simple or continuous (bridg) 230 792
187) Adjectives - ing and ed (felin) 229 007
188) Hypothesis (webmaster) 228 092
189) Auxiliary BE (anonyme) 226 414
190) Articles a/an/the/0 (bridg) 226 267
191) Article The or nothing (anonyme) 225 900
192) Present perfect with Ever - never - (anonyme) 225 509
193) Must or mustn't (laure95) 225 489
194) Present continuous OR Present simple? (bridg) 225 346
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 785
196) To / in order to / so as to / so that (irish21) 220 066
197) Present perfect (bridg) 219 441
198) Comparison (komiks) 218 497
199) What time is it ? (anonyme) 217 632
200) Indirect speech (bridg) 216 544
